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2000 Sierra Trailer Wiring Diagram

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GatorFan

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I added the factory hitch and 7-wire connector but have a question regarding electric surge brakes. My buddy has a Ranger Z520 Bass Boat and he has the electric surge brakes on the trailer. When we connected the trailer wires to my 7-5 adapter, the trailer brakes would not disengage (nor would the turn signals work). I don't have a problem when towing a boat trailer (or any trailer for that matter) except those with those dang electric surge brakes.

 

NOW TO MY QUESTION...

 

Does anyone have the factory wiring diagram complete with wire colors for the factory 7-wire connector? From what I have read, it seems that GM used a blue wire as an auxillary/electric brake connection. I want to make sure I have all the wires connected correctly and possibly replace the factory 7-blade receptacle if it's bad. A friend of mine said there was a lot or corrosion on my factory receptacle so I might not be getting a good connection. I'm not sure that's it because all the lights work when I tow a different boat trailer (other than Ranger) or even tow a car hauler (standard 4-wire).

 

I guess the better quesiton would be did I forget anything when wiring this up. I basically matched the wires from the factory receptacle to the wiring harness that was taped up near my spare tire. I did this over 9 years ago and have not had any issues so far. I was just curious if anyone else has added the factory hitch and connector and has towed something with electric trailer brakes and what they did to resolve this issue.

 

Thanks folks...

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