TEST OR INSPECTION
Connect main wire harness crew cab wire harness connector. Remove main wire
harness in-line 20 amp fuse (WP 0401). Check for continuity across fuse.
If there is no continuity, replace main harness in-line 20 amp
fuse (WP 0401).
Check for 10 to 14 VDC between wire 1663 at main wire harness in-line 20 amp fuse
holder and a known good ground.
If 10 to 14 VDC are present, repair wire 2075 in main wire harness if
repairable (TM 9-2320-325-14&P), or replace main wire
harness (WP 0455).