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Choose your trim in My Garage to confirm exact fit.
Standard Motor Products
$116.55
Dorman
$165.19
Dorman
$202.55
Skyward Automotive
$25.85
Dorman
$10.68
Dorman
$29.20
Standard Motor Products
$5.20
Dorman
$18.39
Dorman
$151.28
Dorman
$63.18
Walker Products
$45.82
Holstein Parts
$28.86
Standard Motor Products
$70.03
Rostra
$45.10
Dorman
$4.60
Standard Motor Products
$173.52
Sunsong
$26.00
Holstein Parts
$27.69
Dorman
$55.45
Standard Motor Products
$22.68
This page groups parts listed for the 2003 GMC Sierra 1500 HD. Some products fit every trim, while others depend on submodel, engine, drivetrain, or brake package. Use your trim in My Garage or the product page fitment check to confirm exact fit.
We offer a wide selection of wiring & electrical parts for the 2003 GMC Sierra 1500 HD. This page narrows the catalog to the year, make, and model; use your trim on product pages to confirm exact fit when a part only fits certain submodels.
We carry parts from trusted brands including Dorman, Standard Motor Products, Walker Products, Hella, and Rostra, plus many more. Filter by brand to find your preferred manufacturer.
Most in-stock items ship within 1-2 business days. Shipping rates are calculated at checkout based on your location.
Warranty coverage varies by manufacturer but typically ranges from 1 year to lifetime. Each product page includes specific warranty information from the manufacturer.
