ENGINE DIVISION SERVICE MANUALELECTRICALFig. 8. Control Circuit TestControlCircuit:High resistance in the control circuitwill reduce the cur-rent flow through the solenoidwindings, which can cause improper function of solenoidor not at all. Improper functioning of the solenoid couldresult in burning of contacts in the solenoid causing highresistance in the starting motor circuit.To complete control circuit test, check the vehicle circuitdiagram to assist in locating the wires and particularswitches involved in the chassis. Observe polarity ofvoltmeter and connect leads to battery post and solenoidswitch terminal as shown in Fig. 8. Crank engine usingthe vehicle ignition switch or push button if equipped,observing the voltmeter reading. If the voltmeter showsless than .5 volt, the circuit is in good condition. If morethan .5 volt, this is an indication of excessive resistance.Note: Occasionally a slightly higher voltage willbe found in the circuit and the circuit still be normal.Isolate the point of high resistance by placing thevoltmeter leads across each component in the circuit inturn. A reading of more than .1 volt across any one wireor switch is usually an indication of the trouble.After completing the cranking volt-age test, batterycapacity test and the voltage drop tests, and the startingmotor still fails to function, remove the motor and makethe no load test as follows.Note that the preceding tests were made in theparticular order to make certain the starting motor circuitis in good condition before needless starter motorremoval.CGES-230 - Page 9PRINTED IN UNITED STATES OF AMERICA
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