Generator 9402.3701-06 malfunctions, their causes and solutions
| Cause of malfunction | Method of elimination |
| The signal lamp does not light when the ignition is turned on, the control devices do not work | |
| Fuse F1 in the mounting block has blown Open circuit in instrument cluster power supply circuit: no voltage supplied from mounting block to instrument cluster Open circuit in the instrument cluster power supply circuit: no voltage is supplied from the ignition switch to the mounting block The ignition switch (lock) does not work | Replace fuse F1 in the fuse box Check the connections of the orange wire from the mounting block to the instrument cluster and the wire itself Check the connections of the blue wire with the red stripe from the ignition switch to the mounting block and the wire itself Replace the ignition switch (lock) |
| The indicator lamp does not light when the ignition is turned on and does not light when the engine is running, the control devices work, the battery is discharged | |
| Instrument cluster malfunction Open circuit between instrument cluster and generator "L" plug Wear or sticking of generator brushes, oxidation of contact rings The voltage regulator is damaged Disconnecting the wire from the brush holder terminal Short circuit in the positive valves of the generator The excitation winding leads have become unsoldered from the slip rings | Replace the instrument cluster Check the connections of the brown wire with a white stripe from the generator to the instrument cluster Replace the voltage regulator, wipe the rings with a cloth soaked in gasoline Replace the voltage regulator Connect the brush holder lead wire Replace the rectifier unit Replace the generator rotor |
| The warning light is bright or dim when the engine is running, the battery is discharged | |
| Alternator drive belt slippage The voltage regulator is damaged The generator rectifier block valves are damaged The generator excitation winding power supply diodes are damaged The generator excitation winding leads have become unsoldered from the slip rings Open or short circuit in the stator winding of the generator, its short circuit to "ground" | Adjust the alternator belt tension Replace the voltage regulator Replace the generator rectifier block Replace the generator rectifier block Replace the generator rotor Replace generator stator |
| The warning light comes on when the engine is running, the battery is being recharged | |
| The generator voltage regulator is damaged | Replace the generator voltage regulator |
| Increased generator noise | |
| The generator bearings are damaged Interturn short circuit or short circuit to ground of the stator winding (generator howl) Short circuit in one of the generator valves | Replace the rear bearing or the front generator cover with bearing Replace generator stator Replace the generator rectifier block |
(Article based on data from the website: LadaMan.ru)