Starter No-Load Test

With a tester and battery connected to starter (see Fig 1) operate starter motor and note voltage reading and tachometer reading. Disconnect starter from battery. Turn load control knob until voltage reading is same as when starter is connected. Read the amperage draw, and if amperage reading is less than specifications, starter has high electrical resistance. If starter RPM is less than specifications, worn bushings or bent armature shaft is indicated.

Fig 1: Connections for No-Load Test

Courtesy of FORD MOTOR CO.