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That is an automatic transfer switch when you have a generator. One is supplied if you have the "generator prep" option even if you don't have a generator. There have been problems with the latest models but yours is old enough that it should be fine.
It really sounds like your surge guard device is causing the problems.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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