It's a relay, an not a resistor, correct?
Besides, my goals are not for car audio,per se but for pure battery protection of my charging battery. I am using this for deep-desert camping, with possibly days that I don't run the truck enough to re-charge a primary battery. Beside some very limited stereo use, this is also for lights, some camping gear, some low voltage electronics, etc.
Doe this make more sense?