Carquest Alternator: Remanufactured, 105 Amps, 8247A
In stock
$209.99
Listed as compatible with this vehicle by the retailer feed.
Check price2003 GMC Sierra 3500 Alternators
27 products listed for this model year in the retailer catalog. Check engine and trim details before ordering.
Carquest Alternator: Remanufactured, 145 Amps, 8292A
In stock
$249.99
Listed as compatible with this vehicle by the retailer feed.
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GM Genuine Parts Alternator: Remanufactured, 145 Amps, 321-2128
In stock
$384.99
Listed as compatible with this vehicle by the retailer feed.
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This site contains affiliate links. We may earn a commission if you buy through them. We do not sell these products or guarantee merchant inventory. Compatibility is listed by the retailer feed for this vehicle; it is not an OEM confirmation. Catalog snapshot: Aug 15, 2026.