I thought the exact same thing. I thought the voltage should be higher. Around the 14.5 volts. The terminals are cleaned and connection's are good. Might be a bad battery being its ass cheap factory Thor battery. All of my cars and trucks had at least 14 volts at start up. Could be a weak voltage regulatory. Will not know for sure until I get home. There are other issues with my rv that I feel I am going to take it in for warranty. I will add this to the list and see what comes out of it. No reason for me to pay for it if it is under warranty
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