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.
Turn battery disconnect switch to OFF position (WP 0007). Remove relay
12 (WP 0402). Turn battery disconnect switch to ON position (WP 0007). Check for 22
to 28 VDC between cab power distribution wire harness wire 2854 (red) at relay 12
connector, terminal 3 and a known good ground.
If 22 to 28 VDC are not present, replace cab power distribution wire harness
and block (WP 0441).