Re: Wire directly to battery?
Do the famous "test light" to one battery cable. Unhook one bat cable and insert a simple 12 volt test light between the cable and bat post.
If a current draw is present, the light will glow, depending upon the current drawn. Unhook the stereo amps to see if the glow stops. If the glow dims, good, you still have other battery powered circuits running, as in a modern stereo unit, i.e., clock & station memory, alarm system, etc.
The stereo amps do have power cables running to them, but the stereo head/tuner sends a Power ON signal to the amps, and the transistor conducts, or turns on the amp. Transistors have a very high reverse resistance and still draws microamps.
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