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My issue was a loose connection also but I put the 80 amp in anyways. The comment about being hooked up to shore power to run the pump, when trouble shooting with lippert they said the pump runs off the battery and shore power or truck would have little affect. A low battery or loose connection creates heat thru resistance and raise the amp demand which can exceed the 50 amp provided by keystone. Lippert on their written operating manual calls for a 50 amp to 100 amp fuse for the pump. I choose to only move the pump to 80 amps and leave the trailer service at 50 amps into the service panel as my coach is still under warranty. I have not had any problem since with the pump.
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