Search by number: 2014 Chevrolet Sonic 1.8L 4 Cyl Alternator ProAmp 21513 $147.00 each OPTIONS: 100 Amps. Manual Transmisison ProAmp 21514 $153.00 each OPTIONS: 100 Amps. Automatic Transmission 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