TEST OR INSPECTION
Remove rings, wristwatches, neck chains, and any other jewelry before working
around vehicle. Jewelry can catch on equipment and cause serious injury. Jewelry
and tools may short across electrical circuits and cause damage to equipment, or
severe burns or electrical shock to personnel.
A short to ground in system may exist. Steps 15 and 16 will verify if wire 1052 (brown) and
1053 (yellow) in cab power distribution wire harness are shorted to ground or if short exist
in siren control.
Turn battery disconnect switch to OFF position (WP 0007). Put EMERG MASTER
switch to OFF position (WP 0007). With a test lead set, check for continuity (short to
ground) across main wire harness wire 1052 (brown) from main wire harness main 3
connector, terminal 1 to a known good ground.
If there is continuity, repair wire 1052 in main wire harness if
repairable (TM 9-2320-325-14&P), or replace main wire
harness (WP 0455).