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 cab instrument
panel B (WP 0311). Disconnect cab pump control wire harness PUMP COOLER switch
connector. While an assistant holds switch in off position, check for continuity across
PUMP COOLER switch, from terminal 5 to terminal 4.
If there is no continuity, replace cab PUMP COOLER switch (WP 0315).