Yes, basically. I forget the voltage, something like 12.2 I think. The little black wire goes to the ground lug on the battery. When you use something that goes to ground, usually your brake lights, it reconnects. My wife has an 04 Escalade, and was having some issues with parasitic voltage drain from all the stupid new fangled computer crap they put on cars now. It helped, but just kinda disguised it. Replaced the battery, and all is well. Guys with corvettes are big users of these apparently. Parasitic battery drain combined with driving the vehicle once a month leads to a dead battery. I'll keep my 97 4Runner. Basically only computer is the fuel injection. Keep it simple.
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