While it looks sophisticated, it is still a couple of diodes with a big heat sink. I had problems with them and prefer a simple large solenoid switching the RV battery in line when when the ignition switch is on (and isolating the two when ignition is off). Maybe it was just luck of the draw, but I had two isolators where the diodes didn't switch off and drained the vehicle battery. The local RV repair said they replace them with the old reliable solenoid when the isolators go bad. Might be why this one is in your garage instead of installed.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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