The starter does not rotate when the key in the ignition switch is turned to the appropriate position
The battery is discharged
Charge the battery.
Break or poor connection of the ground (-) wire. Battery is discharged
Check the wiring and contacts. Measure the battery voltage. Charge it if necessary.
Insufficient current conductivity due to weak or oxidized contacts
Clean the battery terminals and poles. Restore reliable connections between the battery, starter and ground (-).
No voltage at terminal 50 (traction relay)
Broken wire. Malfunction of ignition switch and starter.
The starter turns too slowly and does not turn the engine over
The battery is discharged
Charge the battery.
Insufficient current conductivity due to weak or oxidized contacts
Clean the battery terminals and posts, as well as the starter wire tips. Tighten the wire fastening nuts on the starter terminals.
Carbon brushes do not fit the commutator, are stuck in the guides, are worn out, broken, oily or dirty
Check carbon brushes and terminals, clean them or replace them. Check carbon brush guides.
Insufficient distance between carbon brushes and commutator
Replace the carbon brushes and clean the carbon brush guides.
The collector is worn out, burnt or dirty
Turn down the collector or replace the anchor.
No voltage at terminal 50 (less than 10 V)
Check the ignition switch or traction relay.
The bearing is broken
Check the bearing and replace it if necessary.
The traction relay is faulty
Replace the traction relay.
The starter engages and spins, but the engine does not turn over or turns over jerkily
The gear transmission is faulty
Replace starter.
The starter gear is dirty
Clean the gear.
The flywheel ring gear is damaged
Replace flywheel.
The gear transmission does not disengage
The gear or helical splines are dirty or damaged
Replace starter.
The traction relay is faulty
Replace the traction relay.
The return spring is weak or broken
Replace the traction relay.
The starter continues to rotate even after the ignition key is released
The traction relay is stuck and won't turn off
Turn off the ignition immediately. Replace the traction relay.
The ignition switch does not turn off
Disconnect the battery immediately. Replace the ignition switch.