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.
Stop water pump engine (WP 0022). Turn battery disconnect switch to OFF
position (WP 0007). Open pump house panel A (WP 0539). Disconnect pump house
wire harness pump house cooling fan connector. Check for continuity across pump
house wire harness wire 1640 (black) from pump house wire harness pump house
cooling fan connector, terminal B to a known good ground.
If there is no continuity, repair wire 1640 in pump house wire harness if
repairable (TM 9-2320-325-14&P), or replace pump house wire
harness (WP 0458).
Turn battery disconnect switch to ON position (WP 0007). Close pump house panel
A (WP 0539). Start water pump engine (WP 0022). Allow water pump engine to heat
pump house to 115ºF (46ºC) or greater. Open pump house panel A (WP 0539). Check
for 22 to 28 VDC between wire 1817 (pink) from pump house wire harness pump house
cooling fan connector, terminal A to a known good ground.
If 22 to 28 VDC are present, replace pump house cooling fan (WP 0416).