Solenoid Pull-In, Hold-In Test & Pinion Return Test
CAUTION:
DO NOT allow solenoid pull-in current to flow more than 15 seconds at a time during testing, or damage to coil winding may result due to overheating. Current draw readings will decrease as coil windings heat up.
- Remove starter from vehicle. Disconnect starter-to-solenoid field coil lead wire from solenoid terminal "M". See Fig 1 . Ensure field lead does not touch starter housing. Connect a jumper wire from negative post of 12-volt battery to solenoid field lead terminal "M". Connect another jumper wire from negative battery post to starter drive housing.
- Connect a jumper wire from positive battery post to solenoid terminal "S". See Fig 1 .
- Pinion gear should extend quickly and completely when solenoid is energized (pull-in test). Remove negative jumper wire from starter solenoid field lead terminal "M". Verify pinion remains completely in the energized position (hold-in test). Remove negative jumper wire from starter housing. Verify pinion returns quickly and completely to the de-energized position when jumper is removed (pinion return test).
- If pinion does not return to the de-energized position quickly and completely, the cause is most likely a faulty starter solenoid return spring. Replace starter solenoid. If any of the above tests are not satisfactory, replace starter solenoid.