Skip the Cap, their useless. Spend your money on another battery. I'm not sure what 'switch' Peter was refering to but when running two batteries you'll need a battery isolator to charge both batteries effeciently. If you really want to up your alternator look into Street Wires, I believe they make applications for Contours. Only problem with Car stereo alternators is they are EXTREMELY expensive. Also, check at mralternator.com...I've heard they can rewind your alternator to provide more amperage. HTH.
