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Trailer Brake Controller Wiring

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I am looking for the blue wire for the electric brake controller (#7 pin) from the rear socket to where it is usually ran to under the dash or where ever. The wire must have a relay or something on it because wire tracer will not work on it. The motorhome is 2007 Moaco Diplomat 40SKQ.





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On our 2007 Monaco the trailer brake control wires were all white.  They were in a bundle buried up in the dash.  It took me several tries to finally find them.  They were tied together above the diagnostic connector ports.  Some folks have found them under the drivers side console.  

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