The pump actually has two parts, the pump, and the dryer. Do you know which Leveling system you have? I have a HWH 680 and Monaco went to a HWH 2000 a few years after, although I believe the pump portion is identical. You can go to Welcome to HWH Corporation
. They have wiring diagrams and phone help. Keep in mind Monaco did not always install as directed. My system is supposed to be plumbed after the tanks with a check valve to prevent filling the air tanks with the tiny little pump, instead Monaco plumbed directly into the from tank.
Theory of Operation:
On my system the control wire [#9700] goes to a pressure switch on the output side of the dryer, with a check valve between the dryer and the pressure switch so the switch reads tank pressure. The control wire goes to relay control +. Running current from electrical system is fused near pump and runs to relay. Current flows to pump and dryer from the pump side of relay. The dryer has has a vent solenoid that must close to allow pump to pressurize. When leveling system is satisfied, or tank side pressure switch opens, the big Essex relay opens. This shuts down pump and allows dryer to vent to atmosphere. The check valve on the output side of the dryer, between the dryer and the pressure switch, holds system pressure. The leveling solenoids at the six pack hold pressure in the bags.
I hope this helps.