The electrical circuit of the starter of a gasoline engine
If the traction relay is defective, the starter gear does not engage the flywheel ring gear, and the starter does not crank the engine. On diesel engines, the starter current circuit is activated via the auxiliary starter relay.
Examination
Remove the starter.
Disconnect the field winding wire from the terminal (30).
Connect the wires to the battery for a few seconds «cigarette lighter» as in the picture below. The starter gear should move forward.
Remove the ground wire from terminal C. The starter gear must remain in the extended position. If not, replace the traction relay.
Removing
Unscrew the two mounting bolts, remove the start relay wire terminal from the drive housing, disconnect the relay.
Remove spacers.
Installation
Install the start relay in the reverse order of removal.
Check the relay as described above.
Install starter.