On our '92, there is a rocker switch labeled "aux comp" on the wall on the left side of the driver's seat near where your left leg would be. This switch turns our aux compressor on & off. It should come on at +/- 70 psi on the supply air dash gauge and shut off at +/- 90 psi. Time between cycles should be at least 45 minutes to be in spec. I think there is a 12v compressor on some models that run the toilet, air doors etc. but there is not on on our coach so I can't help you with that.
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Clint C. Johnson / Fran Balm
Coach 289 '92 42'6" 8V92 Hybrid
Several Toads:
XL-7
F-350 4X4 Crewcab
F-250 4X4 Crewcab
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