New Electric Brake Wiring For An Old 72 Truck

[Hayseed4]

So as I have been restoring my truck, I wanted to get the original 1971 K&H electric brake controller back in operation. When the truck was new they used a camper wiring harness and extended the wires a bit to make it to the back bumper. While this was clever, it ran a separate wire for the electric brakes, and it did not utilize the positive wire for trailer accessories. So I wanted a better way. Since I put a complete new wiring harness in the truck, I am less than excited about cutting and splicing into it. Plus every cut in the harness exposes the wires to corrosion with the road grime and salt. So the question now is how to accomplish the wiring without cutting the new harness, and make it look fairly original.