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  1. #1

    Default Electrical issues w/Trailer

    have a 2005 1500 4wd but don't have power to the trailer tail lights at the plug I looked at both fuzz boxes I have power on every thing else what am I missing?

  2. #2


    Welcome to the club, it's great to have you aboard. I am sure someone will be along soon that can help you with this issue. Upload some pics when you can.

    2002 Chevrolet Silverado Extended Cab SportSide: See Mods in My Garage

  3. #3

    Default No power on trailer plug for running lights.

    I am new, but great site:Any way I have no running lights at my trailer plug I have looked at both fuzz boxes what am I missing?

  4. #4


    Welcome to the site.

    Add your vehicle info, to narrow down who knows most about your era truck.
    Look for a break or corrosion in the wiring harness from the plug back to the truck. What part of the truck depends on the year and size.

    Good luck,

    1999 Chevy K2500 Suburban 350
    K&N, reworked cai, Thrush cat-backs
    Vinyl, cranks, floor shift, and rear air!

  5. #5

    mfleetwood's Avatar
    Join Date
    Jul 2010
    Denver, CO
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    Welcome to the Club!!

    I moved your thread to the correct section and changed the title to match your topic. This will help you in getting more responses/ideas.

    Mike (Denver, CO) - 2008 Sierra 1500 Z71 SLE 5.3L 4WD

    SUSPENSION: Rancho 4" Suspension Lift; Rancho RS9000XL Shocks; Rancho Skid Plates; Rancho MyRide Wireless Shock Controller;
    BFG All Terrain KO 315/70/17
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    ACCESSORIES: Westin Brush/Grill Gaurd; Westin Nerf Bars; Truxedo Tonneau; 20% Tint; Tow Mirrors w/Heat & Signals

  6. #6


    Is this a 7-spade plug? If so, check the connection behind the 7-spade outlet. Sometimes it comes loose. If it isn't loose, remove the connection plug and make sure all of the pins are properly seated, as it's easy to bend the pins when replacing the connection cap and that could be the problem. Last, while inspecting/checking this stuff make sure the terminals (both on the connection side and on the 7-spade connector side) are clean and free of corrosion.

  7. #7


    Good advise @SurrealOne. if that doe not cure the problem, recheck the fuses. I don't have a wiring diagram for the '05, but most of the time the trailer circuits are separately fused so a trailer short does not kill the truck lights.

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  8. #8


    Thanks for the tips ,I did find a 30amp fuse bad but still no luck on a fix the lights on one trailer worked and on the boat it did not, what did Charlie Brown say ahhhhhhhhhhh. But the fuse picture did help and I'll look more tomorrow.

  9. #9


    Ok, if one trailer works and one does not....the problem is not at the truck.

    The trailer that does not work has a problem with the running lights, check bulbs, wiring and the ground.

  10. #10


    Update: I found a 30 amp. and a 15 amp. blown because their was a wire touching the travel trailer Thanks all for the help, the fuse pictures did help a lot.

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