If there is 12 volt power to the interior of the rv you need to check the fuse for the appliance in the power distribution center.
Rv 12 volt fuse panel.
Fuses are not like breakers meaning once they blow they have to be replaced.
The fuses in older models protect 12 volt battery powered systems which power lights roof vents water pump and several of the appliance on the lp mode of operation inside the coach of the rv.
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If a fuse is bad it will appear burnt a little on the inside of it.
The biggest issue with older rv distribution panel models is that the converter is noisier which can be very distracting when running.
Test both sides of the fuse for 12 volt power.
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Thanks for visiting the rv repair club site and the opportunity to assist with your power requirement issues.
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Determine which fuse is for the appliance circuit fuses are normally labeled and find a suitable ground for the 12 volt test light.
Place a 12 volt meter at the bare metal section on the top of the fuse.
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However you can test for a bad fuse to verify that is the problem.
Customer service techs december 8th 2015.
The 12 volt dc power goes to the lights switches and slides and to the controls of many appliances including the heater air conditioner and refrigerator.