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I am starting to think it was becuase I had the wipers turned up high and the engine running at idle (about 800rpm). Compressor builds a little less than 120 psi. Checked it with a brand new guage as Doghead suggested. I guess the compressor doens't put out near the volume of air that I am used to.

Easy enough....pull off the cap, loosen the jam nut and turn screw. I'll check tomorrow what pressure it builds while running and adjust if needed. Thanks DieselBob. It appears that I didn't download that manual. I have it now though.

Very possible. Next time I start up the truck and let it sit I'll double check what pressure the compressor maintains.

I shut the truck off and listened for leaks...could not find any. Air system will stay pressurized for hours as long as I don't bleed it off. Never tried leaving it overnight to see if it holds pressure because I am in the habit of draining the tanks every time I shut it off. Seems to build air...

Yes. I drain the tanks EVERY time I shut the engine off...no exceptions.

So...I am out yesterday starting and warming up the deuce. Temps were going to drop low last night and we got a small amount of snow. I fired it up, warmed it up and the air pressure low alarm buzzer went off like normal. Since it was sleeting/snowing at the time, I turned on the pneumatic...