No-Load Test

The starter No-Load test will uncover such conditions as open or shorted windings, or rubbing armature. The starter can be tested, at no-load, on the test bench only.
1. Make test connections with Rotunda Starting and Charging Tester tool No. 078-00005, or equivalent. Ensure cables connected to starter are sufficient to carry high current flow (the same gauge wire as in vehicle).
2. Set rheostat at maximum counterclockwise position, ensuring no current is flowing through ammeter. Record exact reading on voltmeter.
3. Disconnect starter from battery, then reduce resistance of rheostat until voltmeter indicates same reading as that obtained while starter was running.
4. The ammeter will indicate starter no-load current draw. Refer to electrical specifications for comparison.
5. Check for rubbing armature, bent shaft, binding bearings, or shorts in armature and/or brushes if current exceeds specification.