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  1. #1

    Default Random wire by engine bay fuse box

    hey guys, went to pull my drl fuse and noticed this random wire connection by the fuse box. Any suggestions/comments on what it may be for? Truck is a 2012 Sierra SLE All Terrain. (And no, I haven't installed any aftermarket wiring or had anything installed btw)
    Attached Thumbnails Attached Thumbnails IMAG1074.jpg  

    2012 Sierra - 5.3 Z71 - Afe cai, Rhino bedliner, 20% tint all around and 10% brow, 6k hid lows and fogs, Magnaflow catback, tinted tails and front sidemarkers.

  2. #2
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    I have not purchased a new vehicle since 2005, so don't take this seriously but if I had to take a guess, I would say its the fuel pump prime/test wire. My firebird and Colorado have one, not sure if the big trucks do? It looks to be pretty thick, so that's what made me think that.

    Free bump to the top!!

  3. #3
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    Your trailer Hot lead.. If you have a camper hooked up with a Battery you would hook up that wire to charge it.
    08 Z71 Avalanche Mods to date: K&N CAI,Hellwig Swaybars and End Links, Corsa Sport Exhaust, Superchips Programer,IPCW LOF & 3rd brake light and tails, AMI Gas door,Show Hooks and Door locks, Enkei Wheels, with Pirelli tires, StreetScene Bowties, Grant Steering wheel,Muth signal mirrors,SSBC Big Brake kit,Huskyliner Mug gards,Floor mats and Hood shield, McGard Lug nuts and locks, Bedrug, Cervini's Ram Air hood,35watt HID Fog lights, Sylvania bulbs all around ZXE's Highs and Lows, WhiteNight Back up lights,Sirius and HD Radio, SnugTop sitting on deck now Got a Softopper on now,Tempress Boat Hatches.... New Bilstein shocks are on... New Mods coming soon..... X

  4. #4
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    Ooops ha ha!!! Well I learned something new, that is a really cool idea!!

  5. #5
    Master Mechanic zigger215's Avatar
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    Quote Originally Posted by Enkeiavalanche View Post
    Your trailer Hot lead.. If you have a camper hooked up with a Battery you would hook up that wire to charge it.
    +1. Always beatin me to the punch enkei

  6. #6

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    I had no idea, thanks for the replies. Much appreciated

  7. #7
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    Thats what we are here for.....

  8. #8

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    Yep trailer hot lead.
    When I bought my truck last year I spotted that wire and the salesman couldnt tell me what it was for, I refused to sign for the truck until they got a service tech to come out and show me in the GM maintenance manual what it's purpose was.

  9. #9

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    There are actually 2 wires that are like this under the hood if my memory serves me right. The one you spotted and then there is another for the electric brakes. On my 2007 NBS they were not connected to their posts at the front of the fuse box seen in your picture. as well there was no fuses in the fuse box for them. So to connect these you will need the 2 nuts(ahem) and the 2 fuses. I will look for a picture I had of where the other wire was located, i think it was the other side of the fuse box down low in a harness. If I find it I will send you a note if you are interested.

    on my 2011 HD they came all hooked up and ready to go!
    Found it!
    Send me a PM with your E-mail address and I'll send you a an adobe PDF file with the random wire hook up I have. If you want!
    Click image for larger version. 

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    For the wire you found
    Place terminal on larger of the two studs at front of electrical center and secure with M8 nut.
    Click image for larger version. 

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    Last edited by jake's silverado; 01-19-2013 at 01:27 PM.
    Finally a signature and Avatar! I also posted some pics in the Gallery.
    2011 2500HD Crew Cab 4X4 Z71 6Liter.
    2011 Outback Travel Trailer 260FL
    So Happy to not be on the edge of GVWR Over Load!!

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