How to tighten the alternator belt on a VAZ 2107

How to replace the alternator belt on a VAZ 2107

The quality of such a Soviet, and now Russian car, as the VAZ 2107 has been proven over the years. Over time, during the operation of any car, including foreign cars, the need arises to replace some important wearable elements. These engine elements include the alternator belt of the VAZ 2107 car. How to determine that the VAZ 2107 alternator belt needs to be replaced, what is required to carry out such a procedure, as well as the purpose of the device, we will find out in the material.

Step-by-step instructions for replacing a 16 valve car

It is better to carry out the replacement on an inspection groove or overpass, so that it is convenient to work under the machine.

Tools

You should prepare for the replacement procedure by preparing:

a set of keys;
jack;
new consumables.

New alternator belt for replacement
Read also: VAZ 2101 car engine: characteristics, malfunctions and tuning

Stages

The replacement procedure is different for cars equipped with and without power steering. Below we will consider both options.

Replacing the alternator belt on a VAZ 2112 16 valve with installed power steering consists of the following steps:

First, remove the power steering fluid reservoir.
Then, using a key set to “13”, you need to unscrew the nut, thanks to which the generator is attached to the mounting plate.

Generator drive with hydraulic booster
To remove the old strap, loosen the tension roller.
To remove the dismantled part, you need to remove the motor from the support. First you need to unscrew the cushion, and then jack up the engine until a gap appears. We take out the belt through the gap formed.
Assembly is carried out in reverse order.
There are some nuances during installation. First, the tensioner must be clamped to its extreme position.
Then you should tighten the belt on all the pulleys and lastly on the tension roller. This procedure is a little labor intensive.
After complete installation, it is necessary to tension the belt. Using the hammer handle, press and fix the tensioner.

At this stage, the difference between cars with hydraulic booster appears - they do not have an adjusting bolt. Tension adjustment is done using a tension roller.

The procedure on a car without power steering is simpler:

Using a “13” wrench, unscrew the generator mounting nut.
We loosen the belt tension by turning the adjusting bolt with a wrench to “10” counterclockwise.
Having moved the generator towards the cylinder block, we remove the belt.
Next, we put the new consumable on the drive by rotating the adjusting bolt.
At the next stage, we tighten the strap using the adjusting nut. We move the generator as far as possible from the cylinder block. By rotating the adjusting bolt clockwise, we increase the tension, and counterclockwise, we loosen it.
Then the crankshaft must be turned two turns and the tension checked again.

Generator drive without power steering

This concludes the procedure for replacing the alternator belt on a VAZ 2112 16 valves. By doing it yourself, you can save on visiting a car service center. In addition, knowing how to change the alternator belt, you will feel confident on your trip, since you can always change this spare part yourself.

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The need to replace the belt

Initially, it is important to note that the generator and its drive on a VAZ 2107 car, both injection and carburetor, are absolutely similar. The only difference between an injector and a carburetor is that the injector is equipped with a crankshaft position sensor. When it is necessary to replace the alternator belt on an injection-type VAZ 2107, this sensor must be removed.

During the operation of the VAZ-2107 car, the part in question wears out. The need to replace an element can be determined by the following signs:

the appearance of cracks;
whistling when starting the engine, or when sharply pressing the gas pedal, or after driving through a puddle;
disheveled;
sagging.

It is important to know! If the alternator belt breaks on a VAZ 21074, the engine will quickly heat up, which can lead to boiling. The battery remains without recharging, so after a short period of time it will run out.

The device in question, unless of course it is a defect, has a certain resource during normal operation of the vehicle. This resource is usually 50-60 thousand kilometers, after which the belt should in any case be changed. How to do this not only correctly, but also quickly, we will consider in the material.

Instructions for replacing the alternator belt

You must initially purchase a new item. Which belt is best to install on a VAZ 2107 depends on the amount of finances available to the owner of the “Seven”. Experts recommend not saving on such an important element and purchasing a Bosch brand part. Products of this brand are of good quality, which is actually necessary to achieve a long service life of the main components of the car.

The belt cannot be repaired, so at the first sign of wear, it must be replaced.

At the next stage, you will need to make sure that you have the necessary list of materials: open-end wrenches for “17” and “19”, a pry bar and a screwdriver. Only after this we begin to replace the product:

First, loosen the nut that secures the generator itself to the adjustment bar.
After this, you need to use a pry bar to press the generator to the motor. On injection "sevens" it is necessary to remove the crankshaft sensor.
Now we remove the old element and put a new one in its place.
To tighten the belt, you will need to use a pry bar to move the generator. After the device is in place, you can fix the nut.
If you tighten the belt, then accelerated wear of the pump bearings and the generator itself will begin, which will have a bad effect on the service life of these devices. Also, the belt itself can break very quickly.

After completing the replacement procedure, it is imperative to tension the alternator belt. We will learn further how to tighten the alternator belt on a VAZ 2107 car.

In order to perform tension, you will need to check as follows:

To begin, take a screwdriver in your hand and then press on the gap between the pulleys, as shown in the figure above.
After this you will need to pick up a ruler. If the deflection does not go beyond the limits, then the work can be considered completed. How to tighten the belt if necessary?
To do this, you need to unscrew the nut securing the generator, and then move it in one direction or the other, depending on what you need to do: tighten or loosen the tension. We tighten or loosen the device, after which the tensioner nut is fixed.

Changing the strap on the “seven” is not particularly difficult. In this case, there is no need to contact specialists at a service station, because the work can be done independently.

To check the length of an element it is not necessary to remove it. Periodically during vehicle operation it is necessary to check the belt tension.

If the size of the element in question meets the standards, then it is possible not to replace it until its service life has come. Only with timely replacement of the product can unforeseen consequences in the form of element breakage on the road be avoided.

Replacing the generator on a VAZ-2104-2107

VAZ 2107 is equipped with alternating current generators models 372.3701 or 9412.3701.

Malfunctions

The main malfunctions of the VAZ 2107 generator include:

brush wear;
failure of the diode bridge (rectifier unit);
failure of rotor bearings;
short circuit in the excitation winding;
break or short circuit in the stator winding.

Signs of a faulty generator are:

no indicator light on the dashboard comes on;
the voltmeter needle is in the red zone;
sparking inside the generator;
noise during operation (hum or howl);
smoke and burning smell coming from the generator.

Do I need to change the generator?

It is quite difficult to determine the cause of generator failure without having a clue about electrical engineering, so in order to repair it, it is better to contact specialists. Most often, in VAZ 2107 cars, the generator fails due to brush wear, which occurs due to an expended resource or mechanical damage to the commutator. In addition, a short circuit or open circuit in the rectifier often occurs, which is “treated” by replacing the diode bridge.

The hum or howl of the generator indicates bearing failure, which can also be repaired. But if suddenly a short circuit occurs in one of the windings, you will have to either negotiate with home-grown specialists about winding a new winding, which is quite risky, or replace the generator with a new one. The last option would be most appropriate here, especially if it also comes with a guarantee.

A new generator, depending on the model and manufacturer, can cost from 2800 to 5000 rubles. Replacing it at a service station will cost about 500 rubles.

The catalog number of the standard VAZ generator for the “seven” is 21083701010.

Replacing a VAZ 2107 generator with your own hands

If you don’t want to overpay for the work of installing a new generator, you can install it yourself, especially since there is nothing complicated in this procedure.

a socket wrench with a “cardan” for 17 (for models 372.3701) or the same for 13 (for models 9412.3701);
socket wrench 19;
10mm socket wrench.

Work order

Place the car on an overpass or car inspection pit and secure it with the parking brake.
Raise the hood, disconnect the ground wire from the battery.
For easy access to the generator mounts, remove the battery using a 10 mm wrench;
Using a 17 or 13 socket wrench (depending on the model), unscrew the nut securing the generator to the adjusting bar.
Go down into the inspection hole and remove the engine protection.
Remove the alternator belt from its pulley.
Disconnect the wire block from the generator contacts.
Move aside the rubber protective cap and, using a 10mm wrench, unscrew the nut securing the ends of the electrical wires to the “positive” terminal of the generator connected to the corresponding battery terminal.
Using a 19mm socket wrench, unscrew the nut securing the generator stator to the cylinder block bracket.
Remove the retaining bolt and remove the generator from the bottom of the engine compartment.
Install the new generator in place.
Place the belt on its pulley, as well as on the water pump and crankshaft pulleys.
Secure the generator and attach the engine protection.

Conclusion

But the installation of the new generator is not completed yet.

It is important to properly tension the belt here. If its tension is weak, the belt will slip, especially in high humidity.

This is fraught with its rapid wear, as well as problems with the performance of the water pump. If the belt is overtightened, it will damage the generator and pump bearings. Adjustment is carried out by rotating the nut on the adjustment bar.

To determine the correct tension, use a screwdriver or other object to press a section of the belt between the water pump and crankshaft pulleys. The deflection should be 12-17 mm. Then recheck the area between the pump and generator pulleys. Here the deflection should be within 10-15 mm.

If everything is correct with tension, start the engine and check the operation of the generator.

Checking and adjusting the tension of the generator drive belt

Checking and adjusting the tension of the generator drive belt and replacing it

Insufficient alternator belt tension impairs battery charging and leads to increased belt wear. If the alternator belt is too tight, the alternator and water pump bearings may fail.

This is what the alternator drive belt looks like from the top right of the engine compartment. The generator drive belt 2 is installed on the pulleys of the generator 1, water pump 3 and the crankshaft (not visible in the photo).

NOTE Checking the tension of the generator drive belt is performed from above in the engine compartment.

Tension is characterized by the amount of deflection of the generator belt between the pump and crankshaft pulleys (deflection B) or the generator and pump pulleys (deflection A) when a force of 98.1 N (10 kgf) is applied in the middle of the distance between the pulleys. Deflection A should be 10-15 mm, deflection B -12-17 mm.

USEFUL ADVICE It is more convenient to check the deflection A.

To adjust the tension and replace the alternator belt on a VAZ car, you will need: keys “17”, “19”, and a mounting blade. Adjust the belt tension on a VAZ vehicle mounted on a lift or inspection ditch. The belt is adjusted by moving the generator relative to the engine.

Adjusting the tension of the generator belt

The belt is installed, but the work is not finished yet. It needs to be tightened and adjusted correctly. In this case, they make two common mistakes - either they tighten the belt until it turns blue, or they don’t tighten it enough. Both one and the other are bad for the engine:

if the belt is not tightened enough , it will slip on the generator pulley, and the latter, in turn, will not give the required charge to the battery, as a result of which the battery will discharge and quickly fail;
if the belt is overtightened, the load on the bearings of the VAZ-2114 generator will be too high, which will lead to their premature wear or destruction.

This is why it is very important to correctly adjust the belt tension immediately after installation. Initially, we tension the belt as required by the instructions, after which we start the engine, turn on the maximum consumers of electricity on board and listen to the generator (see “selecting a generator”) - it should not emit an excessive hum or squeak, and with a sharp change in engine speed, the belt does not should slide on the pulley with a whistle.

If everything is normal, turn off the engine and collect the fender liners and mudguards. The new belt may stretch slightly, so after a few kilometers it is worth checking the belt tension again.

Checking the tension of the generator belt

There is another way to calculate the correct belt tension. It is more accurate in terms of generator output. The method is simple and easy to check, and then anyone who has ever used a multimeter can tighten or loosen the belt.

We connect the multimeter to the battery terminals in voltage measurement mode, after which we change the belt tension; if the multimeter readings are unstable, the belt slips along the pulley and needs to be tightened. We tighten the belt until the device readings stabilize. After this, you can verify the correct tension of the alternator belt in the usual way.

In this way, you can quickly and without unnecessary hassle replace the generator on a VAZ-2114 and similar VAZ models. Stable tension and good travels to everyone!

Replacing the alternator belt on a VAZ 2101-VAZ 2107

Welcome! This part links the alternator pulley to the crankshaft pulley and the water pump pulley on classic models. On front-wheel drive vehicles, the pump pulley connects the timing belt. A broken alternator belt on a classic will cause poorly functioning devices, because the energy will come only from the battery, and accordingly, if the charge is poor, the devices will malfunction. On the contrary, if the battery is powerful and sufficiently charged, then the devices will not go out for some time and you may not even notice that the belt has broken. And here you need to remember about the pump and pay attention to it. Since the belt binds it, a rupture will lead to the cessation of coolant circulation in the system and the car will begin to overheat.

Note! you will need the following tools: a mounting spatula (a convenient thick stick or a small metal crowbar will do), you will need wrenches for “17” and “19”.

Belt location

Located in the front of the car. In the photo, the red arrow shows the radiator of the cooling system and the bar on which the battery sits (now removed). The belt connecting the three pulleys is indicated in the photo with a blue arrow.

When to change the belt?

The main reason is wear: various kinds of cracks, worn edges, worn teeth. We do not recommend delaying the replacement of the belt, otherwise a rupture will lead to overheating of the engine and even boiling during extreme heat. The battery will quickly discharge in the absence of support from the generator, which will stop spinning and giving out energy.

Note! Have you ever heard a car whistle? The timing belt makes a sound; it occurs for various reasons:

severe wear often leads to whistling;
water or any liquid getting on it (for example, coolant gets on the belt when the cooling system pipes are worn out and leaking. Inspecting the belt and pulleys for moisture will help identify the problem);
low belt tension (adjustment will come to the rescue, read below);
poor quality of the belt, sometimes it’s just an oak belt (by the way, it hardens in cold weather).

Most cars in the winter make a whistle when starting the engine, but a warm car no longer whistles - a sign of a stiff belt.

The video below can save you in an emergency: if your belt suddenly breaks on the road and there is no spare, a regular belt or tie will come to your aid! Watch the video in detail and remember, you never know, anything will come in handy in life.

Do-it-yourself tensioning and replacement of the alternator belt on a VAZ 2110

It is not uncommon for a VAZ 2110 car to experience a whistle in the V-belt connection of the generator. For this reason, it needs to be tightened or completely replaced. Today we will talk in detail about the tightening procedure, and also tell you how it changes.

Why does the whistle occur?

There are several reasons why the characteristic whistle-like sound occurs.

Weak tension. The element slips, and this happens most actively at night. The increased intensity of the whistle at night is explained by the fact that the generator additionally works for lighting.
Gradually the component is destroyed. The belt can dry out, causing its structure to be disrupted and it literally crumbles into pieces. The first signs are cracks, and then whole pieces break off. When moving, the pulley hits and slipping begins. Only replacement is required here.
Although moisture gets on the belt very rarely and evaporates almost immediately, the connection can still whistle. In this situation, tension is required.
The generator itself jams.

Dimensions

The sizes are different, and they are individual for each VAZ model.

If we talk specifically about the “ten”, then adhere to the following rules for choosing a belt size:

In the absence of air conditioning and power steering, 742 millimeters is suitable;

If the car is equipped with a hydraulic booster, then the size will be 1115 millimeters;

If an air conditioner is also present, then the optimal size is 1125 millimeters.

Some craftsmen regularly use original belts from other AvtoVAZ models - Priora and Kalina - to replace them when repairing their "ten".

Performing tension

If there is no wear on the V-belt drive, but there is a whistle, first of all, check the tension level. We will not use complex terminology, but will simply advise you to press with some force on the belt in the middle.

The problem is not the whistling. Due to weak tension, the battery does not charge effectively, and the drive itself begins to wear out faster. Excessive tension can lead to damage to the alternator bearings and stretching of the belt.

Correct tension of the VAZ 2110 generator belt is performed as follows:

Loosen the generator from the bottom and top. A nut is used for this;
Turn the adjusting bolt and adjust the belt;
If you want to increase the tension, the bolt is turned to the right. Thus, you move the generator away from the cylinder block;
To loosen the tension, move in the opposite direction - to the left;
Use a wrench to grab the fastening bolt and turn the crankshaft a couple of turns, then check the tension;
If all is well, the tension is correct, the nut can be tightened back.

Replacement

We have already figured out how to tighten the alternator belt. But such measures are not always relevant. If the element is cracked, overstretched and no longer tensioned, then there is nothing left to do but replace it with a new one.

In fact, replacement cannot be called a complex procedure. Follow the instructions and everything will work out.

Slightly loosen the bolt nut from the lower mounting of the car generator, as well as the tension nut.
Loosen the tension of your belt further. You already know how to do this from the previous section, where we talked about tensioning the alternator belt.
Move the generator towards the power unit, which will allow you to remove the belt from the crankshaft and generator pulleys.
The next step is to install a new element. To do this, you will need a high-quality belt purchased from a trusted store. What exactly this part will be and what size it will be is not difficult to determine. But quality comes first.
First, the belt is put on the crankshaft pulley.
Now it goes to the generator pulley.
At the last stage, you have to repeat the tension adjustment procedure. You already know very well how this procedure is carried out, so there should be no problems.

Changing the belt on a VAZ 2101-VAZ 2107

Removal

It is necessary to have access to the top and bottom of the car. If you have a crankcase protection installed at the bottom, then you will have to remove it accordingly; read the details in the article: “Replacing the crankcase protection on a VAZ.”

Note! Removing the battery will make the belt easier to access. The process is described in the article: “Replacing the battery in cars.”

Evaluate the appearance of the belt. If the condition is good, check the tension and tighten it if necessary. It’s easy to check: press the belt with your fingers with a force of 10 kg anywhere. Either in place “A” the distance by which the belt should bend will be 10-15 mm, or in place “B” 12-17 mm (see picture).

Replacement

New product;
Set of open-end wrenches;

Replacement process:

1. Make sure that the generator has free access from both above and below. If the car is equipped with crankcase protection, remove it;
2. Remove or simply disconnect the battery terminals;
3. Unscrew the nut of the upper mounting of the generator;
4. Unscrew the tension roller nut. There is no need to unscrew it completely, but only until the belt calmly comes out from under the shafts, rollers and pulleys;
5. Remove the old belt;
6. Install a new product;
7. Pull it so that the product does not rotate more than 15 millimeters.

If the condition of the belt is still good, then there is no need to change it, just tighten it. This procedure on a VAZ 2107 car is carried out in an elementary way, since getting to the right place is not difficult.

Alternator belt VAZ 2107

A malfunction of the VAZ 2107 alternator belt can be expressed in two manifestations:

In the first case, the generator stops rotating and producing electricity, which is indicated by a warning lamp on the instrument panel. Moreover, since the VAZ 2107 generator belt transmits torque from the crankshaft to the water pump, if it breaks, the pumping of coolant through the cooling radiator and cylinder block stops, which leads to rapid overheating of the engine. Therefore, if the belt breaks, the vehicle cannot be used.

Belt slipping is often a harbinger of a break. This malfunction is easily recognized by the characteristic “sound accompaniment”, which especially often occurs at high air humidity (especially in rainy weather, when splashes from puddles enter the engine compartment) and at increased load on the generator when powerful consumers of electric current are turned on - headlights or cooling fan. A loud whistle occurs when a weakened belt rubs against the pulleys, which is accompanied by unstable operation of the generator, expressed in voltage drops in the on-board network.

The drive of the generator and pump on the injection and carburetor variations of the VAZ 2107 is identical. Therefore, their problems are the same. The only difference between the injection model is the presence of an engine crankshaft position sensor, which has to be removed during the operation to replace the alternator belt.

Reasons for the break

1. Exhausted resource. The belt needs to be changed at 50-60 thousand kilometers, but many do not do this;
2. Defective product. The manufacturer may produce low-quality goods;
3. Failed tension rollers, shafts and pulleys;
4. Incorrectly selected belt tension level.

1. Lack of teeth. If there are no teeth, the product cannot engage on rollers, pulleys and shafts;
2. External modifications. If cracks, chips, stretching and other defects are noticed, urgent replacement is needed.

If you hear a whistle from the engine compartment when the radio, fog lights, regular headlights, etc. are on, then most likely it’s time to change the belt. Often, the whistling is eliminated if you tighten it, or vice versa, loosen the product a little. If the generator malfunctions, the “Check engine” indicator or, literally translated, “engine malfunction”, lights up on the instrument panel of the VAZ 2107.

How to tighten the alternator belt on a VAZ 2107

If you correctly determine what exactly is causing the slippage, it is quite possible to fix the problem yourself. There are two reasons why the alternator belt slips:

Weak tension.
Contamination (usually motor oil).

Also, a whistle, similar to the sound of slipping, can be produced by a faulty generator bearing.
In any of these cases, repairs do not require particularly high qualifications and do not take much time. Specialized devices and instruments are also not required. You will need a pry bar and two open-end wrenches (or heads) for 17 and 19. The easiest way is to eliminate the weak tension of the generator belt. Usually, over time, the belt stretches a little and begins to slip on the pulleys, producing an unpleasant whistle. The VAZ 2107 generator belt, the size of which exceeds the maximum permissible, must be replaced. You should also change the belt if it is cracked or has noticeable damage.

To check the length of the alternator belt, it is not necessary to remove it. We can assume that if the belt can still be tensioned, its length is within acceptable limits. To tension the belt you will need to do the following:

Using a 17mm wrench (socket), loosen the nut that secures the generator to the bracket.
Loosen the generator rod nut using a 19mm wrench.
Tension the belt while moving the generator using a pry bar.
Secure the generator to the adjusting bracket with a nut and check the tension. The deflection of the belt between the pump and the crankshaft when pressed by hand should be approximately 12-17 mm, between the pump and the generator - within 10-17 mm.
Tighten the nuts firmly, preventing spontaneous loosening.

If a generator bearing fails, repairs are required. To do this, it is necessary to dismantle the generator by unscrewing the mounting nuts indicated above, disassemble the generator and replace the shaft bearing with a new one. This operation is not simple, therefore, if you are not confident in your skills, the best solution would be to turn to specialists. This will help to avoid problems associated with the further operation of the generator and obtain certain guarantees of the quality of repairs.

HOW TO CORRECTLY TENSION THE BELT ON THE GENERATOR

When installing a generator on a VAZ 2107 yourself, the most difficult moment is considered to be proper belt tension. After all, it is through the belt that the generator mechanism will be launched, therefore, any errors and miscalculations when tensioning the rubber product will affect the performance of the car.

The belt tension is performed as follows:

Place the new generator in its regular place, placing it on the studs.
Tighten the fixing nuts only halfway, without over-tightening.
Use a pry bar to install into the gap formed between the generator wall and the pump. Secure the mount in this position.
Place the new belt on the alternator pulley.
Hold the pry bar and begin tensioning the belt.
Tighten the fixing nut in the upper part of the mounting of the generator unit housing.
Afterwards, carry out a preliminary diagnosis of the degree of tension - the rubber product should not sag downward much.
Tighten the lower stud nut until it ends without overtightening.

The diagram shows places for tension quality checks

Next, the quality of the belt tension is checked. Using two fingers, press firmly on the free part of the belt and measure the existing deflection. Normal sagging should not be more than 1.5 centimeters.

The service life of a typical belt for a VAZ 2107 generator is usually 80 thousand kilometers. However, it is recommended to change the belt drive earlier if the generator set is being replaced.

Thus, the generator on the “seven” can be replaced with your own hands, but you must adhere to strict rules and observe safety precautions. If you have problems with the operation of the motor after replacing the device yourself, it is better to contact a professional.

If you have any difficulties or problems, you can contact a certified specialist who will definitely help!

Didn't find the information you are looking for? on our forum.

How to replace the VAZ-2107 injector alternator belt

The belt is necessary to connect the generator and crankshaft pulleys, and on front-wheel drive classic models, the water pump pulley also takes part in the connection.
It is not so difficult to independently replace a torn or stretched alternator belt in a VAZ-2107 with an injector-type engine that has an additional carburetor.

For this you will need:

a mounting spatula, which can be replaced with a crowbar or a strong flat stick;
wrenches 17 and 19.

This is quite enough to carry out repairs. Of course, if you at least have an idea where this very belt is located.

In what situations is replacement necessary?

Wear of the element is characterized by such manifestations as cracks or tears in the blade, worn teeth and uneven edges. If you ignore such a deplorable state of a very important element, it will come back to haunt you with overheating and boiling of the engine, independent operation of the battery, which will lead to its rapid discharge.

If the belt is severely worn, it also shows signs of noise to the owner - it begins to whistle, especially at low speeds. Another reason for a whistling belt may be moisture getting on its surface, which occurs due to worn-out pipes of the cooling system - antifreeze begins to leak.

Some belts - oak - whistle when the car is started in frosty weather, and after warming up the sound disappears. A weak tension is expressed by a whistle, but in this case it is enough to simply tighten it.

Generator check

Problems with the generator set can be avoided if the condition of this unit is periodically diagnosed. Checking the functionality of the generator gives the driver confidence that it is working properly and there is no cause for concern.

You cannot test the generator by disconnecting it from the battery while the engine is running. This is fraught with power surges and short circuits. The easiest way is to contact a service station specialist to check the functionality of the generator on a stand. However, convinced “seven guides” have long adapted to checking the G-221A on their own using a multimeter.

For diagnostics, you will need a multimeter of any type - digital or indicator. The only condition: the device must work correctly in both AC and DC measurement modes.

Operating procedure

Two people will be required to diagnose the generator's functionality. One of them should be in the cabin and, upon a signal, start the engine, the second should directly monitor the multimeter readings in different modes. The operating procedure will be as follows.

Switch the device to constant current mode.
With the engine turned off, connect the multimeter first to one terminal of the battery, then to the second. The network voltage should not be less than 11.9 and more than 12.6 V.
After the initial measurement, start the engine.
When starting the engine, the measurer must carefully monitor the instrument readings. If the voltage drops sharply and does not rise to operating condition, this indicates the exhaustion of the generator's life. If, on the contrary, the voltage indicator is higher than normal, then the battery will soon boil away. The best option is that when you start the engine, the voltage drops slightly and immediately recovers.