VAZ 2107 battery runs down and discharges

Theory “on fingers”: how everything works

On the VAZ 2107, devices can receive power from 2 sources. The first is the battery, the second is the generator. The battery supplies energy when the engine is turned off. It has a certain charge, consumed as needed. The generator produces electricity, but only if the rotor is spinning. That is, with the engine running.

Battery operation diagram: 1. Battery, 2. Negative diode, 3. Additional diode, 4. Generator, 5. Positive diode, 6. Stator winding, 7. Regulator, 8. Rotor winding, 9. Capacitor, 10. Mounting block, 11. Control lamp, 12. Voltmeter, 13. Ignition relay, 14. Lock.

The battery charge is used to start the engine. When the engine starts running, the battery energy is not consumed: the generator supplies all devices with it. A charge is also supplied to it to restore wasted energy. But if the battery is not charging, its own energy will be enough for a limited number of starts. The battery will then be completely discharged. And the car owner will have to solve the problem of how to start a VAZ 2107 if the battery is dead. After all, not everyone has “crocodiles” in their trunk, and not everyone will agree to share electricity with their battery.

Checking with a multimeter

To check, the engine must first be started. We start it up, set the multimeter to voltage measurement mode, and connect its probes to the battery terminals. If charging is in progress, the voltage will be around 14-14.4 V. If the battery is not charging, then the voltage on the multimeter will be 12 V or lower if the battery is very low.

If you connect the battery to a charger and measure the voltage with a multimeter, you can see that the voltage at the terminals is constantly increasing, which indicates full charging. It will stop at a certain value - this is normal. However, if the voltage does not change at all since charging, this means that charging is not taking place at all.

This simple method of checking allows you to understand whether the problem is in the battery itself or if it should be looked for in the generator. In any case, now you know how to check if the battery is charging. However, this requires a multimeter. Fortunately, this is an inexpensive device that is sold in any specialty store.

Indicator light

As can be seen from the diagram, the charging system involves a large number of components and each of them can cause poor charging or its absence. To monitor the battery charging process, the car's dashboard is equipped with a control light.

If the system is in good working order, the control signal turns on after the factory. But when the engine enters operating mode, the VAZ 2107 battery charging light does not light up. This means that the battery's energy supply is replenished from the generator. At the same time, the needle on the voltmeter moves to the green sector.

Signs of a battery not charging:

• The VAZ 2107 battery charge arrow twitches.
• The control signal does not go out. In some cases, the VAZ 2107 battery light blinks.
• The voltmeter needle does not go to the green zone after starting the engine.
• When the engine is running, the voltage on the battery should remain around 13.9.
• The permissible deviation in any direction does not exceed 0.3 V. Undercharging of the VAZ 2107 battery within these limits is not yet dangerous.

A voltage drop to 12 V says: the generator is not charging! lamp is dimly lit - the battery is undercharged.

The VAZ-2107 generator does not charge

It is difficult to imagine a modern car, which almost everyone has at their disposal, without various electrical equipment. After all, it is an electrical device for various purposes that provides additional comfort and convenience. The electrical equipment is charged by the on-board network, and the voltage when the VAZ-2107 engine is running is provided by an alternating current generator. Unfortunately, the current-producing unit may become unusable due to long-term operation, which will be reflected in the charging of the generator.

If the generator on a VAZ-2107 does not charge or electrical appliances are poorly charged from the battery, regardless of which engine the car uses - an injector or a carburetor - you should find the cause of the malfunction as quickly as possible in order to have time to eliminate it in a timely manner.

Where to start checking

If the VAZ 2107 battery icon does not light up, the voltmeter gives normal readings, but the battery does not charge, which means there is no (or insufficient) contact at the terminals. Their severe oxidation can cause the voltage from the generator to the battery simply not to flow. Therefore, it is necessary to remove the terminals, thoroughly clean them, as well as the battery terminals, then reconnect the battery to the on-board network and check the functionality of the charging system.

In the case when the voltage on the VAZ 2107 battery is still below normal, you need to measure it at the output from the generator with the engine running. Is there a big difference between the readings on the terminal and on the battery? Try cleaning the contacts and checking the wire connecting the battery to the generator. Broken - requires replacement.

The next element that is checked is the generator drive belt. If it becomes loose, it will slip along the pulley, which is why the generator will not be able to generate the required amount of electricity. And although charging will be carried out (provided the circuit is in good condition), it will not be enough. At the same time, the engine is running, the voltmeter shows the norm. However, if the system is loaded a little more - for example, by turning on the headlights - then the voltage drops sharply. Then, if the battery charge on a VAZ 2107 disappears, this indicates that the tension belt is loose and slipping. The belt should be tightened; if it wears out during operation, replace it. But you can’t overtighten either: excess belt tension puts an overload on the pumps and generator bearings.

The third component of the circuit that is checked during the initial diagnosis is fuse No. 10 (in the fuse box). It is he who is responsible for supplying voltage to the battery: the VAZ 2107 battery charging fuse has blown - the system will not work.

If everything is in order with the terminals, belt, fuse, the reasons for poor charging of the VAZ 2107 battery need to be looked for further.

Checking generator parts

Disassembly of the device installed on the car is carried out using a mechanic's tool in the following order:

1. Without applying excessive force, unscrew the bolts securing the voltage regulator and the rectifier unit.
2. Using the “8” key, we disassemble the studs that tighten the body and remove the back cover. The generator is divided into several parts.
3. We defecate the bearing and brush assembly. If the remaining length of the contact devices does not exceed 5 mm, they must be replaced.
4. Damage to the bearing sealing rings indicates wear and tear, and the product is dismantled and a new one is installed in its place.
5. We remove the pulley from the rotor, holding it in a vice, while not forgetting about the possibility of deformation of the unit. When tightening, carefully monitor the condition of the part.
6. After this, we remove the shaft from the bearing and check it.

Monitoring the electrical part of the generating device of the VAZ 2107 car, which provides battery charging and power supply to devices. In this case, a multimeter is used in resistance testing mode. It is necessary to ensure that there are no breaks in the rotor and stator windings, as well as the absence of an interturn short circuit. At the next stage, the generator of the VAZ 2107 car is checked for serviceability of the voltage regulator.

This unit is checked according to a certain method using a battery and measuring instruments. After carrying out control measurements and if no deviations are found, we begin to work with blocks of rectifier diodes. On the VAZ 2107, the generator is equipped with a circuit of six semiconductor devices that ensure linearity of output characteristics. If during the inspection process a significant number of faults are identified, elimination does not make sense, it is cheaper to purchase a new one.

What else to check

1. Voltage regulator;
2. Generator rectifier unit;
3. Diodes;
4. Generator for broken windings;
5. Generator brush assembly;
6. Contacts on the terminals of the generator, mounting block.

A malfunction of any of these elements leads to the fact that the charging system is inoperative and the VAZ 2107 battery is not charged.

Let's continue... Diodes are checked with a test light or multimeter. If one of them is broken, the entire rectifier will have to be replaced.

To check the stator winding you need the same device. The resistance between the fasteners of the rectifier unit is measured. If there are no contacts between them, you need to replace either the winding or the entire generator.

The generator itself often fails due to wear on the brushes. To check them, you need to remove the brush assembly and measure the length of the elements. If it is 5 mm or less, the brushes must be replaced.

Almost all of the above system components are replaced when they fail, since they cannot be repaired. Only some of the generator problems can be repaired, but this can only be done by a qualified auto electrician.

The worst thing is if problems with recharging occur while on the road. Without recharging the battery, it will eventually run out completely. And even if you manage to find the cause of the breakdown and eliminate it, you will no longer be able to start the engine with the starter. It will be possible to start a VAZ-2017 with a dead battery only from a tug or pusher.

What to consider when choosing a new battery

According to the passport, the battery is designed for 3-5 years of active use (in reality it turns out to be less). Therefore, over time, it becomes necessary to buy and connect a VAZ 2107 battery instead of a failed one.

When purchasing a new battery, you should consider a number of parameters and characteristics. Battery type: serviced and maintenance-free. The first option allows you to check and replenish the electrolyte level. This makes it possible to use the battery longer.

The next question is: what power will the battery on the VAZ 2107 be most efficient. Batteries with a capacity of 50–60 Ah are suitable for this model. However, given that modern cars are equipped with energy-intensive equipment, it is better to opt for more capacious batteries. In addition, carburetor VAZ models require more powerful batteries - they consume more energy when starting. In terms of dimensions, the VAZ 2107 requires power supplies with dimensions of 242*175*190 mm. The vast majority of samples available on the market fit them.

When choosing a battery, you should also take into account the place of residence of the owner of the “Seven”. For those who live in the south, you can purchase a less powerful battery. Northerners are advised to prefer a battery with a higher capacity: in the cold, the car starts with high energy consumption.

Confronting attackers

Due to the fact that the battery is not cheap, the issue of protecting the VAZ 2107 battery from theft is quite acute. It’s not difficult to open the hood of a “classic,” which is why thieves are keeping a close eye on the “Sevens.”

Experts offer several options for preventing theft.

• Secure parking or secure garage.
• installation .
• Installation of the hood lock. Let’s be clear right away: few people take this step. Welding work is required, the appearance deteriorates, and it is quite easy for a professional to pick the lock.
• Take the battery with you. Labor-intensive, inconvenient, but effective. On the other hand, if the car is left for a short time, it is defenseless: they can even remove the battery in a supermarket parking lot.
• Reliable battery fixation. Almost the most popular method. The fasteners are secured with a secret that prevents dismantling and makes theft difficult. In combination with an alarm it is a very effective technique.

But all experts agree that the most reliable protection for the VAZ 2107 battery against theft is comprehensive. A combination of multidirectional measures will give the best results!