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.
With a test lead set, check for continuity across wire 1053 (yellow) from main wire
harness siren speaker connector, terminal A to cab power distribution wire harness
siren control connector MP2, terminal C.
If there is continuity, replace siren speaker (WP 0428).