8-48. CAB WIRING HARNESS TEST/REPAIR/REPLACEMENT
This Task Covers:
Tools and Special Tools
Negative battery cable disconnected (Para 8-44)
Tool Kit, General Mechanic's: Automotive
(Item 18, Appendix F)
Electrical Tape (Item 40, Appendix C)
Tie Wraps (Item 41, Appendix C)
Multimeter Digital (Item 9, Appendix F)
· The following procedures apply to cab main wiring harness, cab rear wiring harness and electric
joystick controller wiring harness.
· Failure of an electrical device to function is more likely due to a faulty switch or faulty device
rather than to a broken wire. Do not assume that a broken wire exists until related electrical device
and actuator have been checked.
Inspect wires for poor connections at terminals, cuts, or other defects.
Check wire continuity to determine if hidden breaks exist.
Use electrical schematic to trace path of wire (refer to F/0-1).
If possible, connect multimeter leads to ends of wire.
Disconnect suspected wire and an adjacent wire. At one end of wires, connect two wire terminals together.
At other end of wires, connect multimeter leads to terminals of these two wires. An infinite resistance
reading indicates a broken wire.
If 30 percent or more of wiring harness wires have been repaired or replaced, replace complete
Replace any broken terminal rings or connectors.
Replace any broken wires.
Tag and mark both connection points of broken wire. Disconnect broken wire at both ends.
Cut exposed wire and terminals from both ends of broken wire.