If no one knows where it is you can wire it yourself. Go to the fuse panel and check for an empty location that is ignition controlled. put in the fuse value you want and wire the pump to it.
If there is not an empty fuse slot pick any ignition controlled location and wire a relay coil off and the other side to ground. Now feed on side of the normally open side of the relay from the 12 feed to the panel and wire an inline fuse from the other side of the normally open contact to the pump.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles