ENGINE DIVISION SERVICE MANUALELECTRICALFig. 6. Starting Motor CircuitExcessive resistance in the starting or crankingsystem circuit will cause slow cranking speeds and hardstarting. The starting system will function properly onlywhen the "cranking circuit" and "control circuit" with thecomponents are in satisfactory condition.Corrosion, loose terminal, damaged or undersizedcables (wires) will cause cranking problems. In addition,the switches involved must make good electricalconnections when closed. The voltage drop test will beperformed in three steps: cranking circuit, control circuitand grounded side.CrankingCircuit:Voltage drops are measured byconnecting a voltmeter in parallel across the circuit orsection of a circuit being inspected, then reading thevoltmeter while circuit is in operation. To test voltagedrop in the cranking circuit from battery to starter,connect the voltmeter (observing the polarity and voltagerating of meter) to battery post (not clamp) to startermotor terminal as shown in Fig. 7. Prevent engine fromstarting during test. Crank engine and observe voltmeterreading.CGES-230 - Page 7PRINTED IN UNITED STATES OF AMERICA
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