TM 5-3805-290-23-1
ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0013 00
WIRING HARNESS (SHORT CIRCUIT) TEST
0013 00
N OT E
Short circuit is failure of electrical circuit that results in undesired electrical current. Usually, short circuit is
bypass of circuit across load. For example, short across wires in circuit for lamp produces too much current in
wires but no current is felt at lamp. Lamp is shorted out. Resistance in normal circuit can vary, but resistance
between particular circuit and other unrelated circuits is always greater than 5,000 Ohms. This test is for a
short circuit.
1.
Identify connectors and wire numbers of suspect circuits. Use Schematics (WP 0210 00) to identify circuits.
2.
Turn engine start switch and disconnect switch to OFF position (TM 5-3805-290-10).
3.
Disconnect component and ECM from wiring harness. Refer to appropriate work package.
4.
At wiring harness connector for ECM, place one multimeter probe on contact of suspect wire.
5.
Use other multimeter probe to check resistance across all other contacts in connector(s) of ECM and frame ground.
6.
Expected Results. Resistance is greater than 5,000 Ohms for all measurements.
a.
If results are OK, harness circuits are correct.
b.
If results are NOT OK, a short exists in wiring harness between suspected wire and wire with lowest resistance
measurement. Replace wiring harness in question (WP 0169 00 thru WP 0175 00).
END OF WORK PACKAGE
0013 00-71/(0013 00-72 Blank)