MAIN WIRING HARNESS TEST/REPAIR/REPLACE

TM 10-3930-673-20-2

8-49. MAIN WIRING HARNESS TEST/REPAIR/REPLACE

This Task Covers:

a. Test

c. Removal

b. Repair

d. Installation

INITIAL SETUP

Equipment Condition

Tools and Special Tools

Negative battery cable disconnected (Para 8-44)

Tool Kit, General Mechanic's: Automotive

(Item 18, Appendix F)

Materials/Parts

Electrical Tape (Item 39, Appendix C)

Test Equipment

Tie Wraps (Item 40, Appendix C)

Multimeter, Digital (Item 9, Appendix F)

a. Test.

NOTE

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.

(1)

Inspect wires for poor connections at terminals, cuts, or other defects.

(2)

Check wire continuity to determine if hidden breaks exist.

(a)

Use electrical schematic to trace path of wire (refer to FO-1).

(b)

If possible, connect multimeter leads to ends of wire.

(c)

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.

b. Repair.

NOTE

If 30 percent or more of wiring harness wires have been repaired or replaced, replace complete

harness.

(1)

Replace any broken terminal rings or connectors.

(2)

Replace any broken wires.

(a)

Tag and mark both connection points of broken wire. Disconnect broken wire at both ends.

(b)

Cut exposed wire and terminals from both ends of broken wire.

(c)

Cut replacement wire to required length and install proper terminals.

8-154