Solenoid Pull-In & Hold-In Coil Test

1. Disconnect starter solenoid field lead terminal (solenoid-to-starter wire) terminal. See Fig 1 . Ensure field lead does not touch starter housing. Connect negative lead of 12-volt battery to solenoid field lead terminal. See Fig 1 .
2. Connect another lead from negative battery terminal to starter drive housing. Connect lead from positive battery terminal to solenoid ST terminal. See Fig 1 .
3. Pinion gear should extend quickly and completely when solenoid is energized. If pinion gear operates as specified, go to next step. If pinion gear does not operate as indicated, replace solenoid.
4. With battery connected as in previous test and clutch pinion gear still extended, disconnect negative battery lead from solenoid field lead terminal. If pinion gear remains extended, go to next step. If pinion gear does not remain extended, replace solenoid.
5. Disconnect lead from starter drive housing. If pinion returns quickly to de-energized position, go to NO-LOAD TEST. If pinion does not operate as specified, repair or replace starter.

Fig 1: Typical Hookup For Solenoid Test

Courtesy of GENERAL MOTORS CORP.