Does a wire even go there ? I don't see it on any wiring diagrams. I have a wire going to it ( I did it, it wasn't like that, I think ) from a 3 pin connector on the passenger side. The wires on the mate of the connector go thru the dash. Y/G and R/B wires. 1 pin is empty. I have the wire to the pressure switch mated with the Y/G wire. Is that right ? Any help ? Thank you very much.

That is the same as mine


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I forgot. Where's it go ? Is it called something on the wiring diagrams ? Is there a light ? And why ? In case the circuit goes bad ? I know what the pressure difference switch is for and it"s importance. And thank you very much.

I have always believed it goes to the “Brake” light on the dash. Glows constant when brake line pressure is unequal or insufficient fluid. But I have never been able to confirm that.



Here is second version



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The "BRAKE" warning lamp should light if that wire is connected to ground. That's what happens if you lose one half the brake system (like the rear axle) and the brake warning switch shuttle inside gets pushed all the way to one end or the other.

That's also what happens when you pull the parking brake handle, it shorts that same connection to ground.