Starter Cranking Circuit Tests: Notes

NOTE: The tests that follow and the specifications offered are for the American Motors and Ford Motor Company starters with 4 1/2" frames, rated at 150-210 amps. Test results may vary slightly for Ford Motor Company's starter with a 4" frame, rated at 150-250 amps. In voltage drop tests below, readings for Ford Motor Company's 4" frame starter should be: Test No. 1 - 0.5 volt; Test No. 2 - 0.3 volt; Test No. 3 - 0.1 volt; and Test No. 4 - 0.3 volt. Be sure starter motor has attained maximum RPM before taking amperage readings.