[MetroMPG]

Good stuff, thanks. That gives me some ideas of what to look for. I'm just headed out to see what's at the local auto parts store. I want a non-energized, manual switch / disconnect like some of those, rather than a relay/contactor setup. I won't be switching the thing on/off very often, so I don't need the convenience of a remote dash mounted solution. Opening the hood and flipping a simple switch is fine.