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 personnel cab
instrument panel A (WP 0311). Remove relay 7 from cab power distribution
block (WP 0402). Turn battery disconnect switch to ON position (WP 0007). Put
personnel cab FOAM SYSTEM switch to on position (WP 0004). Check for 22 to 28
VDC between wire 2847 (white) from cab power distribution block relay 7, terminal 3 to
a known good ground.
If 22 to 28 VDC are not present, go to Step 12.
Turn battery disconnect switch to OFF position (WP 0007). Check for continuity across
wire 1640 (black) from cab power distribution block relay 7, terminal 2 to a known good
If there is no continuity, replace cab power distribution wire harness and
block (WP 0441).