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Old 05-20-2022, 12:32 PM   #1
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Roof airs, 12volt exhaust fans, and furnace issues

My roof airs and furnace, and both 12 roof exhaust fans run for a while then shut off for several hours, then come back on. I've replaced house batteries, and tested converter and it putting out 13.5 volts. The batteries are reading 13.26 volts. Any suggestions on things to check. I know a little but not alot about dc.
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Old 05-20-2022, 12:48 PM   #2
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None of these items should run unless switched on.

Fully charged battery will be 12.7vDC, not 13.2vDC which is the output of a battery charger. Disconnect the battery from the charger, let it sit overnight, and measure the battery (only) battery the next day. Internally shorted battery (AKA dead) sometimes give strange voltage readings.

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Old 05-21-2022, 06:46 AM   #3
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Welcome to the forum its a great place to get your questions answered. It would help to know what rig you have Year, model, Mfg. I think I would start be doing a load test on each battery. If you don't have a load tester most auto parts stores can do this for you. charge your battery with a stand alone charger disconnected from the rig then load test. JMHO
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Old 05-21-2022, 06:58 AM   #4
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Welcome to the forum !!!!!

Couple of other questions.......

Where are you plugged in to shore power ? Home, Campground? or are you running off batteries when occurs?

Your AC unit(s) are 120V you roof fans and furnace run off 12V DC

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