TM 5-2420-230-24-1
Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry or tools contact positive electrical
circuits, a direct short may result. Damage to equipment and injury or death to personnel may occur.
Use properly sized test leads and ensure care is used when checking for resistance, continuity, or
voltage at connectors. Failure to comply may result in damage to equipment.
(2)
Wire continuity test.
(a)
Disconnect wire from component (e.g., light, relay, motor, etc.) at working end of circuit and from power
end.
(b)
Set up vehicle conditions that will create desired circuit.
(c)
Check continuity from power end of wire to working end of wire.
If continuity is not measured, go to Step (d).
1
If continuity is measured, the fault has not been isolated. Continue with fault isolation tests or notify
2
supervisor.
(d)
Disconnect first connector from working end of wire in line to power source.
(e)
Check continuity.
If continuity is not measured, go to Step (f).
1
If continuity is measured, a fault is in the section of the wire most recently disconnected. Repair wire
2
and perform 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 suspect wire.
(d)
Connect negative (-) multimeter lead to each of other terminals in harness connector.
If there is continuity, the suspect wire and the wire where continuity is measured are shorting together;
1
repair wire.
If there is no continuity, all wires are OK.
2
(4)
Wire repair. Refer to FM 11-60 and FM 11-61 for detailed instructions concerning electrical wiring repairs. Wire
harness repair is limited to splicing and taping of wires at Unit Maintenance.
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