TEST OR INSPECTION
Put WATER TANK DRAIN switch to CLOSED position (WP 0004). Turn battery
disconnect switch to OFF position (WP 0007). With a test lead set, check for continuity
across wire 2200 (black) from valve control wire harness water tank drain control valve
connector, terminal 2 to a known good ground.
If there is continuity, replace water tank drain control valve (WP 0279).
If there is no continuity, repair wire 2200 in valve control wire harness if
repairable (TM 9-2320-325-14&P), or replace valve control wire
harness (WP 0463).