CHASSIS ELECTRICAL TROUBLESHOOTING
Tools and Special Tools
91B Light Wheel Vehicle Mechanic (2)
CHASSIS ELECTRICAL Troubleshooting Procedures
Do not attempt to service or otherwise make any adjustments, connections, or re-connections
of wires until SATS is shut down and batteries are disconnected. Remove all rings, watches,
and other jewelry when performing maintenance on this equipment.
The use of Personal Protective Equipment (PPE) is required when using or handling hazardous
materials associated with operating and maintaining equipment (jet fuel, hydraulic luid, brake
luid, ethylene glycol, cleaning solvents, compressed air, and engine/axle oil). Failure to use
PPE when handling these materials could result in injury or death.
1. Set brakes and chock vehicle. Turn Ignition switch on and check for 12 volts at wire 91 (FO-1, Line 51)
Is 12 volts present?
YES Proceed to Step 2.
Disconnect wire 2 (FO-1, Line 51) at the horn (WP 0128) and ohms check from wire 2 to ground with the
horn button depressed.