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  1. #1
    Jr. Mechanic BillM's Avatar
    Join Date
    Sep 2010
    Fair Oaks, CA

    Default Part Number for Coil Wiring Harness 2003 Tahoe 5.3 Z71 4wd

    Does anyone have the GM Part number for the small wiring harness that connects from the engine wiring harness to the coils. I would like to have both sides, if it is not the same part number. This is for a 2003 Tahoe 5.3 4wd.
    This little harness is clipped to the coil bracket and has the connectors to the four coils.
    I am trying to set up a quick connect test on the dyno to compare the stock coils to the MSD coils. I have 2 sets of coils and 2 sets of brackets, and just need the wiring harness to complete the test. Dyno time is expensive, and I want to change the coils as fast as possible.
    Bill M. Blown 2003 Tahoe Z71

  2. #2


    I did some research and to correctly identify the correct harness for your truck your vin number is needed. You can check this site out and see that there are many different numbers
    You could always go to or call your dealer with your vin and tell them what you are looking for. Most the time they will give you the number with no issues.

    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,
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  3. #3


    My closest dealer won't give part numbers over the phone. Thankfully the dealer near where I work on my truck ... will. Still, dealers are starting to become difficult about part numbers because the Internet is hurting their margins...

  4. #4
    Jr. Mechanic BillM's Avatar
    Join Date
    Sep 2010
    Fair Oaks, CA


    Thanks Guys,

    Pikey gave me the nudge to go to GMpartsDirect from another post. And, I got the correct part number from them with my VIN. I ordered one from them, and I got a lead for another in a local junk yard. Boy, they are expensive!

    SurrealOne is correct about some dealers. But, the one farther away won't give me part numbers; and the closest, and the one I deal with, will.

  5. #5

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