Starting System: Description and Operation

CIRCUIT OPERATION
Power for the solenoid in the engine starter motor is supplied on circuit T40 from the engine starter motor relay. This circuit connects to the contact side of the relay from the engine starter motor.

Power for the contact side of the relay is supplied by circuit A1. This circuit is protected by a fusible link, located at the left toe box. Circuit A1 spliced and provides battery voltage to the ignition switch, and HOT at all times.

The ignition switch supplies battery voltage to the coil side of the engine starter motor relay on circuit A41 when the key is moved to the START position and the operator has pressed the clutch pedal to CLOSE the clutch pedal position switch. Circuit Z1 grounds the coil side of the engine starter motor relay When the coil side of the relay energizes, the contacts CLOSE connecting circuits A1 and T40, supplying battery voltage to the engine starter motor solenoid.

Circuit A0 (battery positive cable) supplies battery voltage to the motor of the starter when the solenoid energizes.

Ground for the coil side of the engine starter motor relay is supplied on circuit Z1 and terminates at the right headlamp ground located at the front of the right frame rail. The engine starter motor, used in this vehicle, is also case grounded to the engine block.