TM 5-3805-298-23-2
0174
WIRING HARNESS AND WIRING HARNESS CONNECTOR INSPECTION
000174
Many troubleshooting procedures will instruct you to test at a specific wiring harness connector. Simply
disconnecting and connecting wiring harness connectors can temporarily solve a problem at times. If this occurs,
the likely causes are loose, bent, or corroded terminals, improperly crimped terminals, or improper routing of wiring
harnesses that cause excess tension on the wiring harness or connectors.
Before disconnecting any wiring harness connectors, monitor and record any active diagnostic codes.
1. Inspect the wiring harness for the following:
excess tension
cracked insulation
broken or burned wires
chafing or abrasion on machine
2. Disconnect suspected wiring harness connector and inspect connector body for the following:
moisture
cracks
warping
damage
locking tab not contacting mating connector
3. Inspect the connector seal for the following:
cracks
cuts
loose fit on connector body
4. Intermittent electrical problems are often caused by poor connections. Inspect pin and mating terminal for the
following:
bent
loose or wobbly fit in connector body
corrosion
elongation or expansion
Verify they are properly anchored in connector body by gently pulling on wire at rear of connector body.
Replace affected wiring harness if wire or terminal moves free from connector body.
5. Perform each of the following tests and inspections to identify faults with the suspected circuit, harness, and
connection.
Inspect Wiring Harness Connectors for Moisture and Corrosion
000174
1. Inspect routing of suspected wiring harness for excessive tension. Otherwise, wire will deform seal
bore.
2. Ensure sealing plugs are in place. If any plugs are missing, replace affected wiring harness. Ensure plugs are
inserted correctly into connector.
0174-10
