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oem 5th wheel / gooseneck wiring

Discussion in 'Towing & Trailer Tech' started by 03 SIERRA, Jan 24, 2013.

  1. 03 SIERRA

    03 SIERRA New Member

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    did you know that some 08 and up silverados / sierras have oem 5th wheel / gooseneck wiring? its up under the bed near the fuel tank inlet. i think its only on the vehicles with the complete tow package hitch, tow mirrors, brake controller. just some food for thought. no more butchering the oem harness to get a 7 way in the bed.
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  2. Crawdaddy

    Crawdaddy Moderator

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    That's handy information. I think I've read before that it's tucked up either over the fuel tank as you mentioned or over the spare tire.
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  3. geo70brem

    geo70brem New Member

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    5th wheel harness

    I looked for the harness under my 2004 HD and couldn't find it. I was told that if the trailer plug was already at the rear bumper there was not another harness tap under the truck. Anyone else know about this?
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  4. 03 SIERRA

    03 SIERRA New Member

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  5. geo70brem

    geo70brem New Member

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    Thanks for the advice. I was looking for an aftermarket harness of some sort. This seems to be just what I need. I have moved the factory plug into the bed for my 5th wheel but i still need a plug outside for a boat trailer. I thought there was something out there but couldn't find it.
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  6. steved

    steved Former Member

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    You will have an extra option on the window sticker for camper/5th wheel wiring @ $25...it isn't part of the basic towing package.
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  7. 03 SIERRA

    03 SIERRA New Member

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    yeah thats right. there is probably a code in the glove box. i do not know what the code is though.
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  8. 03 SIERRA

    03 SIERRA New Member

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    i have confirmed 99-07 trucks do have this option.
    this applies to all 3/4 ton and up trucks 99-current if you look under the back of the truck, follow the wiring from the back of the 7 way if it does not come directly from the wiring harness on the frame you will notice an identical plug like on the back of the 7 way. it will tee off and run to the front of the gas tank clipped to the bed mount bracket on the frame.
    #8

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