SECTION 55 - ELECTRICAL SYSTEM
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39 Step #3 Voltage Flow - LS120 Make sure the battery is connected and the Service/Operate switch is in the OPERATE position. Step #1 - Sit in seat. (Seat switch activated.) Step #2 - Buckle seat belt. (Seat belt switch activated.)
The control module is grounded from harness connector pin #12 to frame ground. Battery voltage continues from harness connector pin #1 through the PK/LTBL wire to the boom solenoid. The solenoid is grounded to the main frame. Problems, Causes and Corrections
Step #3 - Switch the ignition key switch to the ON position. Four diagnostic lights should be on: • • • •
SOL SEAT BELT TIMER
The power originates at the battery and proceeds to the 6-amp circuit breaker. The power continues through the R/LTGN wire to the control module, pin #3 of the wire harness connector. Battery voltage also continues through the R/W power wire from the auxiliary side of the 15-amp circuit breaker to the “B” battery terminal at the ignition key switch. Battery voltage continues through the switch and the O/DKBR wire to harness connector pin #9.
1. SOL (solenoid) light does not turn ON. a. Restraint system was not sequenced properly; resequence by sitting in seat and buckling seat belt. b. Check the seat switch wire harness for a 3-inch bulge for resistor-type diodes that cause proper voltage drop from seat switch; install new harness with diodes. c. Seat wire harness unplugged from seat wire harness with diode; reconnect plug. NOTE: Seat must be in loader and proper wire harness with diode installed for the control module to see the voltage drop to activate the system. NEVER USE A JUMPER WIRE AT THE MAIN WIRE HARNESS CONNECTOR TO JUMP THE SEAT AND HARNESS.
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