Starter No-Load Test

Make connections as shown in Fig 1 (also connect a tachometer to starter). 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 drawn. If amperage reading is less than 67 amps., starter has high electrical resistance. If starter RPM is less than 6700 (4") or 7380 (4 1/2"), worn bushings or bent armature is indicated.

Fig 1: Starter No-Load Test Connections

Courtesy of FORD MOTOR CO.