Do you have trailer in USE mode? In most newer trailer they will not charge in STORE. If you are in USE mode, either you have a bad fuse or circuit breaker or your converter has come unplugged or is bad.
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I have 2017. To charge batteries switch must be “in use.” If they don’t charge then something else is a problem. P.S. Might be good to carry a battery charger with you. You can get them cheap and plug it in to the outside of Airstream.
the Converter also has a dedicated breaker so check that. The Converter manufacturer will have a troubleshooting guide to walk you through testing it as well. since you are getting use out of the battery, I assume the 12V thermal breakers and or fuses are good.
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