So I have a 2005 Fleetwood Pegasus with a solar panel. Everything in the RV was working except for the furnace, AC, and fan which is all controlled by the same thermostat. I have power at all of my fuses and breakers, and I wasn't sure if the thermostat was my issue. But then we had a cloudy day and noticed the lights were going dim and the low voltage alarm went off so the batteries must not be charging from the 30 Amp RV plug. Any ideas?

Answer

Your batteries are kept charged with the built-in CONVERTER, which in turn is powered by your 110-VAC. So make sure you have 110-VAC connected to your RV and then check that your Battery is good, has water in it, and is being charged.

Your Temperature Control panel is also powered by your 12-VDC from your battery.

So, I would suspect your battery and then if it is OK, the Converter.

By the way, your Solar panel is usually there to apply a "trickle charge" to your Coach battery while it is kept in storage or is just sitting idle for a day or so, it is not designed to keep the battery charged and handle a motorhome's power load.

Updated on June 16, 2019

Original Article:

Troubleshooting and Repairing RV Electrical Problems for the Beginner
By Don Bobbitt

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