The solenoid is SMC brand which seems to be a reputible one. I have two others of the same model on my truck already that have been there for about 5 months with no problems.

I don't think it is polarity dependent since other solenoid valves I have worked with were not. There is a red and black wire though and I have the black grounded and the red hooked to the stock horn wire.

From the stock horn wire I tapped into it with butt connector and ran wire to the solenoid. It is connected to the solenoid via male and female wire plugs that are crimped to each wire. The ground for the solenoid is also connected to a grounded wire via the male and female crimped plugs.

I am 99.99% positive that the meter is making good contact with the wires. I shoved the little probe ends into the female plug and they were snug in there.

I tested the continuity between the pos and neg wires on the solenoid last night and it was 0.

When the air ran through it it was a lot of air (like it is supposed to be). In fact, it startled me because I was not expecting it and I hit my head on the exhaust lol. I have the pressure regulator set to ~125 psi and the valve is supposed to be good from 3-217 psi.

I have not taken the pressure reg off yet and tried that only because I could think of absolutely no scenario in which the pressure reg could effect the operation of the valve opening and closing. The check valve opens and closes with 0 psi (when I took it off the tank and hooked it straight to the battery it worked), and it worked at 200 psi when there was no regulator.

Please explain how a faulty pressure regulator could cause this problem, because that is beyond how I am thinking.

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