The VAZ 2108 device, like any other vehicle, involves powering electrical circuits from a battery. To ensure that the battery is always in good condition and does not let you down at the most inopportune moment, a generator is always connected to it.
The battery is especially important when the engine is ignited; while driving, when the car develops sufficient speed, the entire electrical circuit is powered by the generator.
When the question arises about connecting additional powerful electrical appliances to the car, it is very important to match their load with the permissible power of the generator. To do this, it is important to know its technical characteristics. And if the battery lack of charge indicator suddenly lights up, it’s better not to even look under the hood without understanding how the electrical charging circuit, voltage regulator and ignition work.
After reading today's article to the end, you will learn about the connection diagram and dimensions of the VAZ 2108 generator, the main reasons for failure and how to check the voltage in the circuit. If trouble happens to the generator, then don’t worry, we will clearly show you the process of removing and installing it.
VAZ 2108 generator circuit
The VAZ-2108 generator has a rather massive stator winding, since it uses a large cross-section wire. It is with its help that electricity is generated. The wire is wound evenly over the entire inner surface of the stator into recesses specially provided for this purpose in the magnetic core.
It’s worth talking about the latter separately. The middle part, the generator stator, consists of a series of thin metal plates pressed tightly together. They are often boiled on the outside to prevent separation.
- Alternator. The 37.3701 or 94.3701 series can be installed.
- Negative diode.
- Additional diode.
- Positive diode.
- Alternator warning lamp, also known as battery discharge lamp.
- Instrument cluster.
- Voltmeter.
- Relay and fuse box located in the engine compartment in the compartment between the engine and the vehicle interior.
- Additional resistors built into the fuse mounting block.
- Ignition relay.
- Egnition lock.
- Accumulator battery.
- Capacitor.
- Rotor winding.
- The voltage relay is located in the engine compartment.
First aid for a car
The first thing to do in these cases is to check the battery terminals; they may not be in good contact. If there is a weak contact at the battery terminals while driving, it will not be sufficiently charged, for this reason problems may arise during further operation of the car. To fix this problem, you need to lubricate the terminals and tighten them.
If the alternator in your car fails, it needs to be repaired immediately. Most often the voltage regulator does not work. The failure of this generating element has quite unpredictable consequences. While driving, the regulator controls the amount of current required for the car; when it fails, the voltage in the network changes and can be higher or lower. Very often, high voltages cause fuses to blow.
The VAZ 2109 voltage regulator is located directly in the generator of the car itself. When it fails, the generator relay very often fails. It consists of several elements such as an electromagnet, an armature and a switch. These elements interact with each other when electrical current enters them.
Technical characteristics of the VAZ 2108 generator
The following generator models are installed on VAZ 2108 cars:
- 3701
- 3701
Technical characteristics of the first:
- The value of the delivered current (at 6000 rpm-1 and a voltage of 13 V) – 55 A — The voltage value – 13.6 – 14.6 V
- Rotor rotation direction – right – Maximum rotor speed – 13000 rpm-1
- Engine/generator gear ratio 1/2.04
Technical characteristics of the second:
- The value of the delivered current (at 6000 rpm-1 and a voltage of 13 V) – 80 A — The voltage value – 13.2 – 14.7 V
- Rotor rotation direction: right
A normally working, serviceable generator of VAZ 2108, 2109, 21099 cars and their modifications produces a voltage in the range of 13.6 V - 14.6 V. This can be visually tracked using a voltmeter on the instrument panel, but it is better to measure the voltage with a voltmeter (multimeter, autotester
Reasons for failure of the VAZ 2108 generator
Experts believe that the main reasons for the failure of the VAZ 2108 generator are:
- voltage regulator failure;
- damage to the diode bridge (aka rectifier);
- wear of current collecting brushes;
- defects in the charging circuit wires;
- damage or operational wear of the pulley;
- wear of slip rings or commutator;
- short circuit of individual turns on the stator winding;
- bearing failure.
Every self-respecting car enthusiast should understand what causes generator malfunctions most often and how they can be dealt with. It is also necessary not to forget that timely prevention helps to avoid serious problems. Towards the end of the article, we will look at some tips that will help you learn how to test the generator yourself. But let's first learn about the internal structure of the node.
About the compatibility of voltage regulators and VAZ generators
Depending on the generator, installation of a new type of voltage regulator can be done without modifications, or it may require replacing the terminals on terminals “B+” and “D+” and modifying the diode bridge of the generator.
A simple replacement of the LV without modifications can be carried out on generators:
- — 372.3701 installation RN 1702.3702-01 — VTN.
- - 9402.3701/3202.3771 installation RN 9111.3702 - VTN, 9111.3702I2 - VTN, or 9333.3702-02 - VTN.
- — 5102.3771 installation RN 846.3702 — Orbit.
How to check the voltage of the VAZ 2108 generator
In order to check the performance of the VAZ 2108 generator, you need to perform the following steps:
- Using a voltmeter, diagnose the voltage at the battery terminals. When the engine is running and the generator unit is operating normally, this parameter should be around 13.8-14.5 volts.
- Try placing your palm on the unit body with the engine running, you need to feel the vibration. If there is vibration, you will notice it immediately. Moreover, it may be due to wear of bearing parts.
- It is also necessary to diagnose the tension of the device strap, while the motor must be turned off. Press the strap with your finger - the deflection should be no more than 1.5 cm
Installation and connection instructions
For Lada cars (except Vesta, XRAY)
, photo author:
2.
Remove the plastic casing of the generator. To do this, first disconnect the generator excitation wire. Then unscrew the nut from the stud (10mm wrench) and move the power wire to the side. Next, 3 latches on the plastic casing are unfastened.
3.
Remove the standard voltage regulator from the generator. To do this, unscrew two screws ("8" key) and disconnect the wire.
4.
Install a three-level voltage regulator on the generator instead of the standard one.
5.
Output 2 wires for the control module. The module itself should be mounted in conditions of reliable contact with the “ground” and as far as possible from the possibility of moisture ingress. For example, on a hairpin near the right headlight.
For Lada Vesta, XRAY cars (with Valeo TG12C209 generator).
This generator is no different from the previous ones, the only difference is in the voltage regulator. It communicates with the engine ECU via a “lin” interface. The task of this “lin” is to avoid loss of throttle response at power modes. By installing the TRN, we cut off the ability to control the regulator using the ECU!
For this generator there is no ready-made solution in the form of a TRN yet, so the design will have to be modified.
- three-level voltage regulator (article 67.3702-01)
- 2-pin block 904576 NORD YADA
- generator voltage regulator (leave the standard one (if the brushes are live) or ARV1103AD)
- wire for powering the regulator (2 meters)
Interchangeability of the VAZ 2108 and VAZ 2106 generator
The idea of replacing a generator on a classic is as old as the history of the car itself, because everyone who installs more bells and whistles on their own car than a weak Chinese radio, the native 42A G-221 is no longer enough for everyone.
True, even those who neglect the hassle of installing a more powerful generator are annoyed by the weak low beam at idle and poor battery charge. Once, an acquaintance fitted me with a 55A generator on a ball and the idea arose about telling you how to install it in our classic.
Having scoured the Internet to find at least something about installing and connecting it to a car, I didn’t find anything useful, a lot of comments like “Plug it in and forget it” or long discussions of professional electricians, but they spoke in a language that would suit a simple Russian to a person, it’s like a Chinese song, nothing is clear.
In this regard, it was decided to write an understandable article for ordinary people in order to help them do this simple procedure of replacing the generator themselves, without any problems and special skills in working with electricity, but with their hands. It is important to know: There are many alternatives to a standard generator, since with the appropriate skills, means and desire it is possible to install any generator. In the provided article I examine only “economical” VAZ generators from other models, because:
- They are cheaper.
- They are more common.
- They are easier to change - you don’t need to find or make any special fasteners and completely change the electrical system.
How to remove the generator on a VAZ 2108 yourself step by step instructions
In order to remove the VAZ 2108 generator with your own hands, you must perform the following procedure:
- In order to easily remove the VAZ 2108 generator, it is necessary to remove the engine protection.
- During the dismantling process, the VAZ generator must be removed together with the bracket, since its fastening bolt will be impossible to pull out due to the position of the body side member.
- Now disconnect all electrical terminals from the generator
- Then you need to loosen the adjusting nut and the generator mounting nut from below.
- Move the generator forward and remove the loose belt
- Unscrew the bolt and remove the adjusting bar
- We find it at the bottom of the engine compartment (shown in the photo) and unscrew the two bolts securing the bracket.
- Then, carefully pushing down, remove the VAZ 2108 generator
- After repairing or purchasing a new generator, we install it in the reverse order, taking into account the fact that the long bolt securing the bracket should be closer to the generator drive.
- After completing the installation of the VAZ 2108 generator, tension the drive belt
Replacing the device
To replace the VAZ 2109 regulator, you must first disconnect the negative terminal from the battery. Then use a screwdriver to remove the two bolts that secure the housing to the generator. Disconnect the wire and remove the brush holder assembly. That's it, all that remains is to install the new one in place. As you can see, the replacement is not difficult, and if you have a replacement, you can do it in the field.
Video about checking the VAZ 2109 voltage regulator:
The VAZ 2109 model car began to be produced in the early 90s. Today, this model is significantly different from older versions - it is more convenient and easier to use. The practicality of a car largely depends on the constant current of power - the voltage regulator and relay are responsible for this.
How to install and connect a VAZ 2108 generator - step-by-step instructions
Installation of a new generator is carried out in the reverse order. Take a close look at the condition of the bottom bolt. If there is damage to the threads, it is better to replace it.
It will be easier for you to repair the generator later. When installing, pay special attention to belt tension. If it is not tensioned enough, your battery will not charge well. But if you tighten the belt too much, the bearing in the front cover will be destroyed. As a result, you will get an unpleasant whistle when the engine is running. And the reason for this is the appearance of play in the bearing.
The installation of the generator on the VAZ 2108 must be carried out in such a way that even the slightest distortion does not occur.
