01-11-2017, 07:20 AM
I don't know if this helps or could even work on your more complex systems than my 93 coach has.
I relocated the output of my 120V compressor through a check valve into the inlet of the main air dryer for the engine compressor. Since I converted from the factory installed finned air dryer to a Bendix AD-9 I have never seen a hint of water in any of the tanks. It would be more complicated for you to do this since you have an additional 12v compressor. While parked my air consumption is quite minimal so I have never bothered to periodically start the engine and run the dryer through a moisture discharge cycle. If air consumption was considerable I would probably do this to ensure dry air.
What I can say is that the engine dryer really does its job.
I relocated the output of my 120V compressor through a check valve into the inlet of the main air dryer for the engine compressor. Since I converted from the factory installed finned air dryer to a Bendix AD-9 I have never seen a hint of water in any of the tanks. It would be more complicated for you to do this since you have an additional 12v compressor. While parked my air consumption is quite minimal so I have never bothered to periodically start the engine and run the dryer through a moisture discharge cycle. If air consumption was considerable I would probably do this to ensure dry air.
What I can say is that the engine dryer really does its job.
Jon Kabbe
1993 coach 337 with Civic towed