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Battery isolator solenoid12/18/2023 If one installs/connects a solenoid based isolator correctly, this destructive situation can not happen, even if the solenoid fails. One went through four alternators until the alternator rebuilder finally figured it out. There have been more than a few Safari owners who lost multiple alternators until they finally figured out the cause. With today's modern alternators, it will blow the diodes (rectifier bridge) and the voltage regulator inside the alternator, hence it pretty much cooks it. With old technology alternators, you could get away with it. This is the equivalent of disconnecting the positive cable while the engine is running. The more common and destructive failure is, when the diode fail inside the isolator, it cuts the power connection between the alternator and the battery. Probably pretty rare though.Ī diode based isolator failing in the way you describe, were it back feeds into the alternator is rare and would be the better way to fail. I currently have a diode based one and it's 22 years old and working fine but I've read where they can go bad, and back feed into the alternator, draining the batteries. As far as I know the original solenoid had lasted over 20 years. and it took about 15 minutes to change out. I don't remember the price, but it was under $50. The two important features were, it had to be constant duty rated, and had to have silver contacts. I found a replacement for a reasonable price at a local auto parts store. My previous coach had the solenoid style and the solenoid went bad in it.
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