Search by number: 2002 GMC Full Size Pickups 4.3L 6 Cyl Alternator ProAmp 8247 $109.00 each OPTIONS: Standard 105 Amp ProAmp 8237 $136.00 each OPTIONS: Optional 130 Amp ProAmpN 8247N $153.00 each OPTIONS: Standard 105 Amp ProAmpN 8237N $188.00 each OPTIONS: Optional 130 Amp Why is there more than one unit for my car? Look at the TECH SPECS when more than one unit is shown for your car. AMPS (ELECTRIC CAPACITY): must match you vehicle electric requirements. *** Call us if you are looking to increase your unit capacity! OE ALTERNATOR MANUFACTURER: It is recommended to match the Make of your alternator