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Originally Posted by H2Much
I had my electronic guy (stereo shop) go through and connect a voltage meter to each wire drawing current from the battery while the car was off. He had to go through and touch each wire to see which ones were drawing what on current. The Bose amp was drawing more than the others by a long shot, and it wasn't shutting off when the car was turned off. There are going to be certain things that will draw current no matter what, but not enough amps to kill the battery quickly. Take for example, Viper alarm system. It will draw current when the car is off, but it is ony like .01 amp or something like that. The Bose amp was drawing around 2 amps consistently, which was a problem. If you are running your stereo through the Bose amp, you can't unplug it, as it will shut off the tunes. If you are running around it with your own amps, then you should be fine to unplug it.
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Here's a method that works and anyone can do it! Dissconnect the negative terminal of the battery. Stick a test light between the ground terminal lead and the battery ground. If there's a current draw, the light will light up. Start with the thing you know, i.e., radio, security, etc., and pop the fuses. If it's still lit, continue popping fuses until it goes off. It's a simple way to find a complete circuit. From there, you'll be able to see how man amps it's drawing.