I've got an old EL8A unit that I installed in my 98 Dakota short cab around 2004 using the auto "turn-on" method. The unit worked well, but after running down the battery several times, I ended up pulling the fuse a few years ago and now I'm finally getting around to figuring out this problem.
I ran a VOM meter across the terminals of the fuse holder and see a current draw (I think it was 0.6A) with the ignition key off, is this normal? Could spurious noise on the high-level speaker inputs cause this unit to draw power? Would changing the "turn-on" to a key on source be the solution?
One more for you - my truck has the Infinity mid-level system with a separate amp. I have my tube wired tapping the speaker leads to the rear speakers after the amp, is this OK?