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Dave, I own a Viair 400p-rv compressor and love it. I would highly recommend the purchase. Reference hooking it up, in the Viair manual it says:
IMPORTANT: Engine must be running while using this compressor.
Before attaching air compressor power clamps to your vehicle’s battery terminals, check to make sure that the ON\/OFF switch of your compressor is in the OFF position. Attach the Positive (+) battery clamp (Red) to the Positive terminal of the battery and the Negative (-) battery clamp (Black) to the Negative terminal of the battery. Always keep your vehicle’s engine running while operating compressor to avoid draining your vehicle’s battery.
When I read your post I couldn't tell whether you were talking about your RV or tow vehicle. Just wanted to let you know what Viair says about engine running.
Thanks, Tom
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