electrical, is 13.4 volts normal?
I recently had the motor in my furnace replaced by an extremely experienced RV appliance guy. When I put the furnace back in it never ran right. The fan sounded weak. But it was putting out heat so...
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I think your clue is that it did not sound right when you put it back in. It was bad from the start. You do need to make the measurement with it running so there is a proper load on the wire.
