How can i connect a sencond car battery to my sound system?
A second battery is never a good idea as it’s an added strain on the alternator to charge two batteries AND supply power for the car. The ONLY time a second battery is useful is if the audio system is to be used with the car off. If your total system power is 1000 watts RMS or more, you will need to: 1. Upgrade the alternator to a high output alternator 2. Upgrade to a heavy duty deep cycle battery 3. Upgrade the “Big 3” – that is to replace the power wire between the battery and alternator, the ground from the battery to the chassis and the ground strap from the engine/tranny to the chassis with at least 1/0 AWG wire. Failure to do this will result in you replacing them anyway as the alternator will eventually fail. Here is a guide that will calculate what size alternator and power wires you need http://www.datafilehost.com/download.php… You’ll need Microsft Excel to use it.
