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  1. #1

    Default It appears that the Silverado's hood uses a ground strap, why?

    The other day I was under the hood and noticed that there appears to be a ground strap from the body to the hood. What function does this serve? I would figure that the hinges being bolted to the body would serve as a ground.

  2. #2

    Default

    I believe that the ground strap is there for the underhood light, which you may or may not have depending on the year and model of your truck. All of my trucks have had the strap, but in 2003 they stopped making the light standard so my 01 had it, my full load 03 avalanche doesn't, and my base model 03 Sierra 3500 does. But, that would be the only reason for the ground strap on the hood - just because the hinges aren't designed as grounds, so the strap is there to ensure proper grounding.

    2001 Silverado Reg. Cab Not-So-Base -- SOLD
    2003 Avalanche Z71. No Cladding. Check out my Mod thread.
    1974 Triumph Spitfire 1500 - Work in Progress
    2003 Sierra 3500 Duramax. The Newer, Better Work Truck


  3. #3

  4. #4
    Legend

    Join Date
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    everett, massachusetts
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    Default

    I have installed ground straps on all my vehicles over the years. this helps to reduce radio interference as well as the underhood light return. the hinge does make a poor conduction path for current flow.

  5. #5

    Default

    my 05 yukon Xl has the strap, no light

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors, http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  6. #6

    Default

    The painted hinges and the painted hood surfaces make for a very unlikely ground. The ground is needed for any light connection, and it does help with shielding unwanted RF signals. Keeping all body panels at the same voltage potential is key to reducing unwanted noise in the electrical systems.
    Ray

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

  7. #7

    Default

    My 04's got the strap and no light, too. As others have noted, reduction/elimination of unwanted electrical noise is the reason that strap exists.

  8. #8
    Legend


    Enkeiavalanche's Avatar
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    Piermont,NY, back in Northern NJ now, But may be in IL soon....
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    Default

    I know the light is gone because of the Merc switch they used is no longer made in the US.. I did find one from a Junked truck that I would like to put under the hood...
    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

  9. #9

    Default

    Quote Originally Posted by Enkeiavalanche View Post
    I know the light is gone because of the Merc switch they used is no longer made in the US.. I did find one from a Junked truck that I would like to put under the hood...
    My experience on my 01 Silverado is that the mercury switch didn't work that well anyway and I'd have to hit the light a few times before it would turn on. I just find it strange that my 03 Sierra 3500 is a base model truck and it has an underhood light, but my 03 Avalanche that is fully loaded doesn't.

    Reducing RF noise and such and keeping all of the body panels with the same electric potential makes sense as a reason to keep the ground strap around almost 10 years after they stopped installing the lights.

    2001 Silverado Reg. Cab Not-So-Base -- SOLD
    2003 Avalanche Z71. No Cladding. Check out my Mod thread.
    1974 Triumph Spitfire 1500 - Work in Progress
    2003 Sierra 3500 Duramax. The Newer, Better Work Truck


  10. #10

    Default

    There was a lady who bought a buick lesabre brand new and her first drive to work the car died on the highway. The dealer towed it back and after inspecting found nothing wrong, the car started right up no problems to be found and gave it back. The next day same thing, died in the same spot. After a few more tows back to the dealer and always dieing in the same spot one of the techs rode with her to see if she was doing something wrong. Sure enough the engine stalled in the same spot. The tech looked around and found nothing wrong under the hood but then noticed the hood ground strap was not connected from the factory so while waiting for the tow he took care of it. The truck arrives and they go to load it on the rollback but it starts up. Baffled they do more test drives with no more problems. After writing a report for gm he got a phone call from gm's diagnostic center. They asked him if there were high tension power lines that crossed the highway where it died, and there was. The interference from the powerwires were amplified by the ungrounded hood and affected the crank position signal in the coil module.

    Random things like ground straps and weights bolted to exhausts are there for a reason, be it obvious or not
    01' 1500 LT Z71 ECSB 5.3L
    line-x'd front brush guard with KC Daylighters, 6000k HID lows and highs, rewired highbeams, Trans-go mild shift kit, custom stainless duals, 3500 dually OEM taillights, K&N CAI. Still have OEM fender flairs and leveling kit in boxes waiting for time.


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