Due to the company I work for purchasing all new trailers, I installed a 7 pin connector to accommodate the change. I connected Brown-Tail/Running Lights, Green-Right Turn/Brake, Yellow-Left Turn/Brake, Light Green/Reverse, and White-Ground. The White-Ground was not connected to anything from the 4 pin connector, however, I connected it to the white wire of the trucks trailer connector wire harness. It caused the Hazard/Stop fuse to blow when I applied the brakes. Everything else works fine. I disconnected the White-Ground wire and brake lights work without blowing the fuse. Why does it show it as ground, but is apparently not needed? Also, the new trailers have brake assist. Is there a kit I can get to activate that, or is the Blue and/or orange wire tied up in the existing harness for that? Any help is appreciated.
4 pin to 7 pin trailer connector upgrade
- Thread starter Yukon96
- Start date
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Well, I've decided not to install brake assist anyway, Because I won't be towing any trailers big enough to require it, by law. Judging from the total lack of responses to this thread, I'm guessing no one here tows much with these trucks.
We tow plenty with these trucks so I'm not sure why nobody responded. I don't know the answer to your question as to the wiring.
I know the NBS have 7 pin connectors and I use a 7 pin to 4 pin adapter. Not sure if there's 4 pin to 7 pin adapters.
I did go ahead and purchase the 7 pin upgrade kit. The only issue I had with it was when I connected the white, (ground), to the trucks white wire, according to the instructions, it blew the Stop/Hazard fuse. So I disconnected it, and it seems to work fine now.
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