06 T800 lift axle only works with the key off

There is an electric valve near the center above my lift axle on my 02 pete 379. I have no idea what the electronic part is for. Mine works whether the key is on or off. The only time it will raise on its own is if I set parking brake out that has nothing to do with electric obviously since our brakes are an air knob

 

you have a steerable lift axle?

 

The electric valve is located on the center bracket on my steerable lift axle. When I run the wires up to the dash I wired in a switch to lift/lower the axle along with a relay. On that relay I had a choice of having lift axle up or down with key on/off. I elected to have axle up with key off. I also have the axle lift when tranny is put in reverse.

I think you need to find that electric valve and start tracing wires to the relay and switch a couple wires around.

 

Does it appear to be a factory installed pusher axle? Switch in dash like factory install. If so, last six of VIN and can look up diagram. If not, we need for info and pictures.

 

It is a factory installed lift axle, Watson Chalin SL100126-2. I attatched three diagrams: the plumbing, wiring diagram, and picture of solenoid. Solenoid is located on hvac box. Looks like fan clutch solenoid. My first question is are reverse lights functioning properly? The solenoid is what is used exhaust air from the switch when transmission is in reverse. Fuse for solenoid is igntion powered.