re: Pulled the wiring harness from my fifth wheel

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Also my truck was registering when I hooked the rv up but after I rewired some stuff it's no longer doing so.

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This sounds like a ground. Its basically what recognizes that a trailer has been connected. I know that's how it works on GM. And I also believe if it doesn't recognize a trailer connected, the brake control doesn't activate. Also, if its wired correctly and the battery on the trailer is good, you should be able to pull the break away and the brakes should lock, even not connected to the truck. They usually sound like a buzz at the wheels

Push come to shove, you could always buy an aftermarket controller and wire it in. They're stupid simple.