Quote:
Originally Posted by lust4speed
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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I also prefered to install the solenoid system. I found it to be more reliable, smaller, and easier on the charging system. The isolator will lower the voltage from the alternator connection to the two battery connections by 1/2 to 1 volt. If anyone is thinking about using the solenoid system, be sure to use a solenoid that is made for continous duty. Start solenoids are limited duty and will fry if used for this application.