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I have been looking for some time for an affordable device that will provide protection from overvoltage should my alternator fail. This device made by Olsen Technologies is affordable ($149.00) and easy to install. It is designed to short out the resettable breaker in the alternator field circuit when the voltage from the alternator exceeds 16volts.
I am going to purchase one and bench test it before installing . It can be purchased from Earthx batteries or the Olsen website, olsentechllc.com.
If anyone has experience with this device please post a response.