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Sure you already checked it out, but look at your wires, something may have come loose or a loose connection somewhere.
check your ground. Did it to me in the past…
check ur fuses. check ur pressure switch
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was the pressure switch… 
Yep, and I would have said it is NOT the pressure switch because:
When I turn the compressor switch to on it just clicks.
How could that be??
Has any moisture or debris been taken into the inlet port on the compressors? This could be your answer. Also, if they have been ran past their expected working hours (which is normally around 350) then there could be some mechanical problems.
My recommendation is to take an Allen Key, and pop the head off. Examine your flapper valves, piston ring, and inspect for rust or dirt.
Post up some pictures here if you’d like help in your examination. I also gave Lance a heads up in your ViAir thread post.
We’ll figure this out. If worst comes to worst, I’ll give you a great price on another set of Dual 450cs, OR if you’d like an upgrade…the 480c.
Garrett
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thats good that
it whas only the switch at lest you
know your commpressers still
work so thats good.
peace:)