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There is a factory connection just off the end of drivers side frame rail, you can start there or if you just gotta have more fun than that go to the cab.
As for me I'd clip and work in the mess area. Put new connectors and try to cover it all up good.
The previous owner of my truck had done a real job on the brake light wiring too...I had a baseball sized
ball of electrical tape back there...I couldn't help but laugh as I undid it to find bare wires and a jumbled mess.