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 ON position (WP 0007). Turn Service Drive Lights On
(TM 9-2320-347-10). Turn On Clearance Lamps (TM 9-2320-347-10). With a test lead
set, check for 22 to 28 VDC between wire H012 (white) at relay 14 connector, terminal 1
and a known good ground.
If 22 to 28 VDC are not present, go to Step 26.
With a test lead set, check for 22 to 28 VDC between wire 2794 (red) at relay 14
connector, terminal 3 and a known good ground.
If 22 to 28 VDC are present, replace relay 14 (WP 0402).
If 22 to 28 VDC are not present, replace cab power distribution wire
harness and block (WP 0441).