Got an amp meter?
Disconnect the negative battery cable and put the negative lead of the meter on the battery terminal and the positive lead of the meter on the negative battery cable. With everything shut off, you should read near zero or "0" milli-amps (you'll get some reading if you have a working clock or newer radio). If you're reading 50 milliamps or higher, start pulling fuses one by one until there's a major drop in your meter reading. This will narrow your problem down to a specific circuit. Most power draws are from improperly wired or malfunctioning modern stereo's.
|