Seen this "mystery drain" many times. Check spark at the battery to see how big the drain is. For this simple test, blow away any (explosive) battery charging fumes. Leave one terminal on and gently touch the other to its post in fairly dark surroundings. Then try it again with the wires taken off the alternator. Your spark is now probably much less. Usually bad diodes leaking electricity backwards through the alternator cause this drain. Replace the alternator or the diode pack inside it. Some mechanics recommend actually measuring the drain.... hahaha. OK whatever.
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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