Generators 1631.3701 or 192.3771 do not have a built-in voltage regulator and work in conjunction with a transistor voltage regulator type 13.3702–01, which has electronic short circuit protection in the generator excitation winding circuit

The regulator provides the battery charging voltage in the range of 13.4–14.7 V at a generator speed of 2800–12,000 min–1, a load of 5–40 A and a temperature of –20 up to +80°С.

At the terminals "Sh" and "-" of the regulator, the voltage drop should be no more than 1.6 V at a current of 4 A in the excitation winding circuit of the generator and a temperature of 20 ° C.

Regulator Test

Before checking the voltage regulator, check the condition of the wires and the reliability of the connections between the generator, the voltage regulator and the battery.

It should be noted that the lack of charging current may be caused by the operation of the regulator protection in the event of a short circuit in the generator excitation winding circuit.

When the short circuit is eliminated, the voltage regulator is restored.

The voltage regulator can be checked on the stand mod. 532M or directly on the car.

To check on a car, you need to have a DC voltmeter with a measurement limit of up to 20–30 V and a division value of 0.1–0.2 V.

Start the engine and, maintaining the engine speed within 1700–2000 min–1, turn on the dipped headlights. In this case, the charging current on the ammeter should be no more than 10 A.

If the ammeter shows a charging current above 10 A, you must turn off the dipped headlights and turn on the parking lights.

Measure the voltage at the "+" terminal of the battery, it should be in the range of 13.9-14.6 V at a regulator temperature of 20 ° C.

If the voltage is not within these limits, then the voltage regulator is defective and needs to be replaced.

Removing the voltage regulator

Voltage regulator type 13.3702-01 is fixed with two bolts in the engine compartment on the mudguard of the right side member under the expansion tank.

Checking and replacing the voltage regulator type 13.3702–01

With the ignition off, disconnect the block from the electrical connector of the regulator.

Checking and replacing the voltage regulator type 13.3702–01

With a 10 key, loosen the nut of one and unscrew the bolt of the second fastening of the regulator.

We change the regulator, wrap the bolt, tighten the nut and connect the connector.

To check the excitation circuit of the generator, disconnect the connector from the voltage regulator, connect a test lamp or a voltmeter to the terminal “Ш” of the plug connector of the wiring harness and the regulator housing and turn on the ignition.

Checking and replacing voltage regulator type 13.3702–01

If there is no voltage (the lamp is off), one of the following malfunctions is possible:

  • - violation of the contact of the excitation winding with slip rings; breakage of the excitation winding;
  • - brushes sticking in the brush holder channels;
  • - burning, oxidation and severe wear of the slip rings of the rotor.

Replacing the engine voltage regulator ZMZ-4062

The voltage regulator is combined with a brush holder and fixed on the rear cover of the generator under a plastic casing.

You can replace the regulator without removing the alternator from the car.

For convenience, remove the washer reservoir and, unfastening the rubber belt, set aside the expansion tank.

Repair of generator 9422-3701

Disconnect the wires from the three terminals of the generator

Generator Repair 9422-3701

Remove the back cover by releasing the three latches (shown on the removed generator)

Generator Repair 9422-3701

We unscrew the two screws and remove the brush holder with the voltage regulator (shown on the removed generator)