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Author Topic: Holiday Rambler brake controller wiring question  (Read 332 times)


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Holiday Rambler brake controller wiring question
« on: July 14, 2017, 12:21:02 PM »
2004 HR Admiral 32' gasser --

I'm wanting to add electric brakes to a Master Tow dolly and will need to install a brake controller (Prodigy P2) in the motorhome.  I searched high and low for the trailer wiring plug installed by Ford in the F53 chassis.  I FINALLY found the plug (white with all white wires individually labeled) but there's already another harness (standard wire colors) plugged into it.  Both harnesses disappear into the dash and I am not able to trace them.  The motorhome has a 4-way flat plug and a 7-way RV plug on the rear and both are functional although I've only tested them for lights so far.  I'm thinking that someone bought an aftermarket harness, plugged it into the Ford harness, and then ran the wires to back for the plugs.  In this case, the blue wire should not be powered since there's no brake controller installed.  IF this is the case, then I would only need to tap into the 4 wires needed for  the brake controller and leave the other wires for the lights alone.

Am I on the right track here?
« Last Edit: July 14, 2017, 01:17:01 PM by csshafer »

Gary RV_Wizard

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Re: Holiday Rambler trailer wiring question
« Reply #1 on: July 14, 2017, 01:18:36 PM »
Maybe call HR/Monaco and ask them if that second harness is theirs?
Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL