Quote:
Originally Posted by Dean
Check the shop manual for your truck (Or do some googleing). You may already have a 7 wire harness running through the truck, just not the plug on the end. My Furd did and I just plugged the controller into the cab and changed/added the jack at the back.
I'd suggest a mounted 7 wire jack and adapt back to 4 if you need it rather than the other way around. not sure what your setup looks like, but many hack job 4 wires hookups that just hang out of the chassis somewhere without a real mounted jack are trouble and the wire gauge is often not heavy enough for the amperage that brakes need.
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Unlikely it will be pre-wired for brakes. Ideally, you should add a 7-wire in addition to the existing 4-wire, and not convert either way.