Turn battery disconnect switch to OFF position (WP 0007). Disconnect main wire
harness main 2 connector. With a test lead set, check for continuity across wire 1188
(black) from main wire harness main 2 connector, terminal D to main wire harness
driver side body wire harness connector, terminal 4.
If continuity is present, repair wire 1188 in cab power distribution wire
harness if repairable (TM 9-2320-325-14&P), or replace cab power
distribution wire harness and block (WP 0441).
If continuity is not present, repair wire 1188 in main wire
harness (TM 9-2320-325-14&P), or replace main wire
harness (WP 0455).