TEST OR INSPECTION
Turn Service Drive Lights Off (TM 9-2320-347-10). Turn battery disconnect switch to
OFF position (WP 0007). Check for continuity across cab pump control wire harness
wire 1027 (black) from cab pump control wire harness non-operating switch connector,
terminal 8 to a known good ground.
If there is continuity, replace non-operating rocker switch (WP 0315).
If there is no continuity, repair wire 1027 in cab pump control wire
harness if repairable (TM 9-2320-325-14&P), or replace cab pump
control wire harness (WP 0443).