One my '02 Horizon, there is an air compressor manifold, under the hood, to the right of the generator, which has a threaded plug in one of the ports. With air pressure dumped, I removed the plug, and threaded in a brass fitting connecting a short piece of high pressure line to an air shutoff valve and gauge, then to a quick-disconnect air-hose fitting. I bought all of the components for this project at Lowes or H.D., for around $25. I wanted a shut-off valve in case there is a leak in the quick-disconnect (sometimes they leak).
This is the same way that Winnebago uses for the factory-installed air valve on later model Journey & Horizons. You will have 110-120 psi, with your engine runing at high idle (just use the cruise-control to bump the idle speed up). Works great.
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CaptBill
USAF 1965-1971; USCG Master
2002 Horizon 36LD
Indian River, De
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