[pestes]

 With this wiring, air pressure from the coach is continuously applied to the rear. Does the left rear stay up when you do this?

Yes, the left rear of the coach stays up with this. The leaky valve is still spewing air, but there's more coming in on the RAISE solenoid than leaking out the tag solenoid valve. This was my big hint that the front is not dropping because the rear is dropping. I've hardwired the rear to not drop, even with the leaking valve. Yet the front left still drops in travel mode, and only in travel mode. But not the right.

You have spoken of leaky valve and you can hear the valve. Are you talking about the ride height control valve located inside the dual drive tires? Or are you referring to the solenoid valve on the six pack?

No, sorry, this is the valve I mentioned on the post a few days ago, which appears to be part of the tag axle pressure control. I've climbed under the coach and traced that rear leak to that valve. No noise from the Whisper anywhere near the airbag itself.

The fact that the coach will not build air pressure when the travel solenoids are open says you have a MASSIVE leak in the air bag system.

The coach does build pressure with the engine running, in all scenarios. With the engine off, pressure drops no matter what due to the valve leak in the rear. That valve is always in play on the tag axle, regardless of the status of the 6 pack solenoids, so it always drains any supply.


As I understand the plumbing, the 2 travel solenoids in the front 6 pack both take the output of the HCV and connect it to the airbags. The fact that the left drops and the right does not makes me think that there must be check valves after the split from the HCV before the 6 pack and that my leak must be between the left check valve and the 6 pack.