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Art, Got your message and read your post. I'm glad you've resolved the issue. One 20ga little wire causing all that trouble... I hope this helps others get their systems in working order.

T fitting is what bolts to the wheel. There should be a valve core in one side and the fill hose attaches to the other. 2 seconds sounds like a valve core is still in there (or something is disconnected in the cab)

1. How long is the 1 light (HWY) flashing before the trumpet sound? The trumpet sound is the system saying "I'm done trying" and blowing off the pressure in the lines in the center of the truck (rubber duck bill looking things). It's giving up. 2. Have you checked to see if there's a valve...

Make sure your air is over 120psi. Then start her up. Do you have one blinking light? If you get the trumpet after that and 5 flashing. ...you have a leak. You mentioned that you have hissing inside the cab. Is it a contained "hiss" or does it sound like an air escaping near you "hiss"...

I'll second that, it's leaking somewhere. 5 flashing is generally a leak and it can't get pressure from somewhere to somewhere else. Generally, it's usually a substantial leak...not a pin-hole. Mine does this when I lose a connection at the wheel hub (slips off). 5 solid lights is much...