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TM 9-2320-304-14&P
4-11
Organizational Maintenance Instructions (Cont)
NOTE
M1120 is equipped with 24-Vdc circuits. The troubleshooting fault that referenced these
general wire tests will provide voltage information for testing wires.
(d) Check for the required voltage at the working end of the wire.
1
If the required voltage is not measured at the working end of the wire, go to step (e).
2
If the required voltage is measured at the working end of the wire, the fault has not
been isolated. Continue with the fault isolation tests or notify supervisor.
(e) Disconnect the first connector in line from the working end of the wire to the power
source.
(f) Check for the required voltage at the working end of the wire.
1
If the required voltage is not measured at the working end of the wire, go to step (g).
2
If the required voltage is measured at the working end of the wire, a fault is in the
section of wire most recently disconnected. Repair the wire and perform the voltage
test again.
(g) Repeat steps (d) and (e) until all sections of the suspect wire are tested.
(2) Wire continuity test.
(a) Disconnect wire from the component (light, relay, motor, etc.) at the working end of the
circuit and from the power end.
(b) Set up truck conditions that will create the desired circuit.
(c) Check continuity from power end of the wire to the working end of the wire.
1
If continuity is not measured go to step (d).
2
If continuity is measured, the fault has not been isolated. Continue with the fault
isolation tests or notify supervisor.
(d) Disconnect the first connector from the working end of the wire in line to the power
source.
(e) Check continuity.
1
If continuity is not measured, go to step (f).
2
If continuity is measured, a fault is in the section of the wire most recently
disconnected. Repair the wire and perform the continuity test again.
(f) Repeat Steps (d) and (e) until all sections of the suspect wire are tested.
(3) Wire harness shorting wires test.
(a) Disconnect wire harness connector with wire suspected of damage.
(b) Set multimeter select switch to Ohm.
(c) Connect positive (+) multimeter lead to harness connector terminal of the suspect wire.
(d) Connect negative (--) multimeter lead to each of the other terminals in the harness
connector.
1
If there is continuity, the suspect wire and the wire where continuity is measured are
shorting together; repair wire.
2
If there is no continuity, all wires are OK.
(4) Wire repair. Refer to TM 43-0158 for detailed instructions concerning electrical wiring repairs.
Wire harness repair is limited to splicing and taping of wires at Organizational Maintenance. If
a wire harness cannot be repaired, notify DS Maintenance.
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