TM 5-3805-258-24-19 5 0 B O P E R A T O R ’ S S T A T I O NE L E C T R I C A L T R O U B L E S H O O T I N GPROBLEM D: Fault Alarm is ON When It Must Be OFF.Possible Causes: a. Fuel pressure switch is bad (open when there is no pres-sure).b. A broken wire that goes to the fuel pressure switch.c. A short in the harness (wire to the fault alarm is shortedto a wire with + 24V).d. Operator panel is bad.1. Remove the BR wire from the fuel pressure switch and connect it to machineground.Fault Alarm StopsFault Alarm Does Not StopFuel pressure switch or ground wire to switch is bad.Go to Step 3.Go to Step 2.2. Remove the B wire from the fuel pressure switch and check for continuitythrough the switch with an 8S4627 Circuit Tester.ContinuityNo ContinuityGround wire is bad. Repair or replace the harness orIReplace the fuel pressure switch.connect a ground wire to the switch.3. Connect wires to fuel pressure switch again. Disconnect the harness plugfrom the operator panel.Fault Alarm StopsFault Alarm Does Not StopGo to Step 5.There is a short in plug or harness between wire toSocket 10 that sends power to fault alarm and an-other wire (1, 11 or 16) that has power. Go to Step 4.4. Use an 8S4627 Circuit Tester to check for a short between Sockets 10 and 1,10 and 11, and 10 and 16.Repair or replace the harness.4-107
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