Search by number: 2003 Mercury Marquis 4.6L 8 Cyl Alternator ProAmp 8313 $121.00 each OPTIONS: Standard 130 Amps 4GHO; PCM controlled; Plug 339 ProAmp 8315 $143.00 each OPTIONS: Optional 135 Amp Police Option; PCM controlled ProAmpN 8313N $182.00 each OPTIONS: Standard 130 Amps 4GHO; PCM controlled; Plug 339 ProAmpN 8315N $214.00 each OPTIONS: Optional 135 Amp Police Option; PCM controlled ProAmp 8315-MI240 Call for Price OPTIONS: 240AMP EXTREME DUTY 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