TEST OR INSPECTION
Put cab FOAM SYSTEM switch to off position (WP 0004). Reconnect air line at roof
turret foam B multi-metering valve cylinder. Disconnect pump house wire harness
ROOF TURRET FOAM B foam system flow control manifold connector. Put cab FOAM
SYSTEM switch to on position (WP 0004). Put cab FOAM SELECT switch to B
position (WP 0004). With a test lead set, check for 22 to 28 VDC between valve control
wire harness wire 4055 (purple) at roof turret foam B foam system flow control manifold
connector, terminal 1, and a known good ground.
If 22 to 28 VDC are not present, repair wire 4055 (purple) in pump house
wire harness if repairable (TM 9-2320-325-14&P), or replace valve control
wire harness (WP 0463).