The next weak link in the circuit would be the little rocker switch on the outside of the heater. I know that my unit has the power cord plugged in under the sink in the cabinet I would unplug it and plug a light into it to see if it was working other wise there is no other spot in that circuit that could be bad.
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2001 Ford F350 7.3 CC LB DRW
2011 Wildcat 25 RL
Maintenance Mechanic 40+yrs
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