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Title: Flat works ...
Review: I have some kind of electrical drain in my truck which would pull the battery down to zero in a few days if not constantly driven - especially in cold weather. It was never intended to be a permanent installation just a stop gap until I found the electrical drain. But, I'm leaving it installed. It's very easy to install and use, deters theft, and allows quick connection of a battery charger while isolating the battery from the rest of the electrical system.I tried other switches but had trouble mounting them in the crowded engine compartment of the F-250. If I'd tried this first, my problem would have been solved in five minutes. I'll still haven't traced down that electrical problem - it's not much of a problem any more. Highly recommended.
