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Old 01-02-2016, 09:24 PM   #1
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Which plug for 5th wheel?

I just bought a new 2016 GMC 3500 with the $35 factory 5th wheel wiring option. Can anybody tell me what wiring plug I need to buy to mount in the side of the bed that will connect to the factory wiring? Maybe an Amazon link? Sorry for the rookie question but this is our first 5th wheel.
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Old 01-02-2016, 09:57 PM   #2
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You can reach the bumper in most 5th wheels. But eventually you'll want it in the bed. Something like this - the more model specific the better. Typically requires drilling a hole in the bed with a hole saw:

http://www.amazon.com/gp/product/B00...=sr_1_1&sr=8-1
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Old 01-02-2016, 10:02 PM   #3
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Wiring harnesses/plugs.......etrailer

2016 GMC Sierra 3500 Trailer Wiring | etrailer.com
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Old 01-02-2016, 10:05 PM   #4
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Originally Posted by Old-Biscuit View Post
Wiring harnesses/plugs.......etrailer

2016 GMC Sierra 3500 Trailer Wiring | etrailer.com
Thanks for the link. I found this earlier before I made this post but there were so many listed I wasn't sure which one to get.
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Old 01-03-2016, 09:12 AM   #5
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Thanks for the links guys. I appreciate it!

It looks to me like these options plug into the existing factory 7 way plug at the bumper. I have the optional 5th wheel wiring so I don't think I need to plug into the bumper wiring. Guess I need to crawl under the truck and see what the optional factory wiring looks like. I think it's tied up above the fuel tank.
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Old 01-04-2016, 08:55 AM   #6
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I crawled under the truck, dropped the spare tire and found the wiring. This is what I bought: http://www.amazon.com/gp/product/B00...ilpage_o01_s00
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Old 01-04-2016, 10:03 AM   #7
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I crawled under the truck, dropped the spare tire and found the wiring. This is what I bought: http://www.amazon.com/gp/product/B00...ilpage_o01_s00
That's just the plug receptacle. You'll also need a few feet of 7-wire RV harness to wire into the connection under the truck and the plug you bought.

On my current rig I made a 4-foot long 7-wire extension cord and run it from the 7-pin receptacle on the bumper up into the bed only when towing a 5er or gooseneck trailer.
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Old 01-04-2016, 10:34 AM   #8
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My truck came with the $35 optional 5th wheel wiring. This includes an extra wire harness that is zip tied up above the spare tire. The wires are probably 6' long (just a guess). All I need to do is cut a hole in the side of the bed, pull the factory wires through and attach them to this plug.
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