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.
Open roof, bumper, and pump cooler junction box (WP 0423). Put cab or pump
operator's panel PUMP COOLER switch to ON position (WP 0004) and release. Check
for 22 to 28 VDC between cab roof wire harness wire 4037 (orange) at roof, bumper,
and pump cooler junction box terminal strip and a known good ground.
If 22 to 28 VDC are not present, go to Step 40.
Turn battery disconnect switch to OFF position (WP 0007). With a test lead set, check
for continuity across wire 1640 (black) from roof, bumper, and pump cooler junction box
to a known good ground.
If there is continuity, replace pump cooler control valve (WP 0370).