The following recommendations will help you solve the problem of troubleshooting in the field.
When the key is turned in the ignition, the starter turns slowly, does not start, or it turns a little and stops. If at the same time the signal lamps light up weakly or go out, first check the battery charge. A disconnected or oxidized starter power wire, or a starter short to «mass» may be due to the following reasons. If the battery has been disconnected before, the battery terminals may not be connected well enough. Otherwise, to start the engine, use «smoking» or towing.
If the signal lamp continues to burn and clicks are heard in the engine compartment, the traction relay rod may be stuck. You can try to knock a metal object on the traction relay - as a rule, the stem is released. If this did not bring success, it can be assumed that the brushes are worn out or the contacts of the traction relay are dirty. In this case, it is necessary to remove the starter and replace the traction relay and / or brushes. If the warning light is on, but the starter does not make any sound at all, the connections between the battery and the starter should be checked.
If you hear that the starter is spinning, but the engine crankshaft is not turning, it can be assumed that the traction relay, the drive mechanism are malfunctioning, or the teeth of the drive gear and flywheel are damaged, as a result of which they do not mesh. In this case, engage first gear, move the car forward slightly and start the starter again. If unsuccessful, replace starter.
If the starter continues to turn after starting the engine, although the key in the ignition is released, it is possible that «freezes» traction relay, i.e. contacts do not open (The ignition switch may also be faulty). If this occurs, stop the engine immediately.
If the drive gear continues to rotate after starting the engine (identified by howling sound), perhaps the drive lever does not return to its original position, or the gear itself hangs in the ring gear. In this case, apparently, it will be necessary to install a new starter and / or a flywheel ring gear. In any case, you need to dismantle and check the starter.