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So no clunk on the solenoid so it has gone out on me and the horn button isn't showing a good ground. No big problem on either. I know what I need and will get it all on order. Thank you all for your input helping me narrow down what I need to look for.

I will give that a try first thing tomorrow. It's dark already and I have poor lighting. Plus I'm at work and have stuff to get done. Don't you just hate how jobs get in the way of fun. Lol

Doing more troubleshooting I have come to the conclusion that I have either a bad solenoid or a bad horn switch. All the wires check good with a meter. I guess I will just get online and order a new solenoid and switch.

I get power to the solenoid. When I disconnect the lead going to the horn button and connect a tester (no air pressure at this point) I get a full 24 volts. When I start the truck and build air pressure.and press the horn button on the steering column I get no horn even with full 120 psi in...

I have no working horn. I have already put a meter to everything and have power (22 to 24 volts) at connector 26 (according to wiring schematic on the -4 that is the hot wire). When checking resistance I have good ground. My question at this point is this... Is there a way to open up the...