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You mean something like this? You will still have to do the cutting and add connectors to the brake light circuit to make this work, but it will look Mil-Spec when it's all done. http://eriksmilitarysurplus.com/rushycoms.html

Rick, No such luck having that spare wire. I counted the wires coming out of the trailer receptacle...there were eight. I didn't do the trace after a visual of the rear of the plug. No #37 coming out of the "K" hole in the back of the receptacle, everything was accounted for according to the...

We have the same reasons for trying to locate the mysterious #37 wire. I was also looking for a wire already in the trailer receptacle to use as a trailer brake circuit. I'm wondering if that wire just isn't folding back inside the taped harness, possibly right on the firewall where the circuit...

If you follow that wire #37 back from the trailer receptacle (from right to left), you'll see it marked "37 Auxiliary Power (Tractor Only)" I once tested the "K" pin in the receptacle on my M35A2C and found no power. Do you have that circuit breaker on the firewall with a #37 wire on it? Sounds...