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Pics of the setup so we can point you in the right direction. You cops take some sand paper to the shaft under the spring to clean it up. Use some high grit. Also take a multimeter to it and verify it is getting a good connection when the button is pressed.

Correct, don't try and push it down. The box in the picture is for the horn. I don't know of a trick to fix it, mine failed and I just pulled the wire out from the bottom. From what I could gather from looking at it the wire goes to a piece on the bottom of the shaft and there is a little...

800 series is the same. The contact box looks like the upgraded version. Given that the column would provide -24VDC. If the solenoid requires +24VDC he will either need to add a relay to actaviate -24V to the solenoid or remove the ground from the solenoid, add a constant +24 and run the...

939, for horn polarity. 1070 about the dual horns. I agree about convince factor on that one.

1070 has two horn systems, the manual air horn and a lower volume button horn. The button does provide negative voltage to the solenoid. Constant + on one side of the solenoid and - from the button. Part of the troubleshooting procedure is to see if the +24 is present at the solenoid.