I have a 2019 Roadtrek with two lithium batteries the voltage is about 13.18 which I think is low I ran the engine for 1/2 hour and no change in voltage. I think my UHG is not suppling any charge to ...
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Go to Carrado & Sunlight Owners or Hymer Aktiv Owners and wannabees facebook forums. There are two known experts on the Underhood Generator, batteries and the Balmer. They are Sam CArswell and Lam May something. They are extremely helpful and can give you lots of info about the systems. There is also a Roadtrek etreks and ecotreks forum that has a lot of information on it. I have a Hymer Sunlight Van One with one battery. When there was big gathering in Florida in January with 45 Hymers, they were reprograming and moving many balmers from underneat the engine area to the up by the hood. Great group of people. Good luck
