No-Load Test

The starter no-load test will uncover such conditions as open or shorted windings, or rubbing starter motor armature. The starter motor can be tested at no-load on the test bench only.

CAUTION: Make sure that the starter motor is securely mounted in bench vise while energizing, as starter motor will move or jump.

NOTE: A remote control starter switch should be used in the S circuit for turning the starter ON and OFF during testing.







1. Make test connections with Rotunda 800A Load Tester and Stand 041-00112 or equivalent cables connected to starter, large enough to carry high current (the same as in the vehicle). The starter motor will run at no-load. Be sure that no current is flowing through ammeter (rheostat at maximum counterclockwise position). Determine exact reading on voltmeter.
2. Disconnect starter motor from battery. Then, reduce resistance of rheostat until voltmeter indicates same reading as that obtained while starter motor was running. The ammeter will indicate starter motor no-load current draw. Refer to Specifications for a comparative value. Specifications
3. If current exceeds specification, check for rubbing starter motor armature, bent output shaft, binding bushings, or shorts in starter motor armature or brush holder.