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When it is not building pressure, remove the large air line(output) at the compressor unloader valve. Is any air pressure being produced? If no then remove the small control air line at the compressor unloader valve. Is any air pressure being produced now? If not then the unloader valve is...

Okay, now we know the horn solenoid is not the problem. Wire 26 is not the problem either, it should always have 24V on it. Somewhere wire 25 is being grounded is what is causing the horn to blow. Wire 25 could be making contact against the body anywhere between the horn solenoid and the horn...

Have you ruled out the horn air solenoid valve by disconnecting the wires to see if it stops blowing? A spring causes it to stop blowing the horn which may be wore out or stuck. I don't know where that connection is in the wiring you asked about. I would guess it's on the engine side of the...

It sounds to me like the air valve on the horn is always allowing air past it to the horns regardless of wheather or not the horn switch is activated. The horns probably do not produce sound at less than 59psi. The constant air drain from the horn air valve is keeping the pressure from building.

The unloader valve is built into the top of the compressor. It has a spring which keeps it in a position to send the air generated by the compressor to the air dryer. When the air governor senses 120psi it sends air through a small line to the unloader valve overcoming the spring and changing...