Depending on how mch wattage you have to your aftermarket radio you might have to hook it up to an accessory battery separate from the one that runs your car. before you do that tho take your car to an auto parts store that can test your alternator and battery for free. try advance auto or auto zone.
Yes and that was due to bad installation. I
have had 3 car stereos installed on my 98 RAV4 through Best Buy and never had
battery problems. I even had 2 amps installed as well but the installers had to
make me buy this 200-dollar thing that would not drain the battery.
If you are getting a drain through the
radio's power supply it could eventually drain down the battery if it was
improperly installed, I would pull the fuse for the radio and see if the drain
continues, if the drain does not stop there is another short somewhere. To
learn more :
http://www.xcardiag.com/wholesale/automotive-battery-analyser-vat-560-tool-536.html
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