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SO do you have a volt meter???
Are you plugged into power???
Look near the battery for a tripped breaker, below is a picture sometimes they will put one on the cable from the converter to the battery, most have a tiny tab on them that will pop out when they trip, as a general rule it would be 18" from the battery and can be on the frame, if you see any at all you should see the same voltage to chassis ground on each post, if one side reads higher then it is the problem.
Sometimes you might also have a battery disconnect inside near the main entry door or above it, if you have that please let me know, beyond that I would confirm the voltage at the battery make sure it is over 12 volts, if it is good and you do not have a breaker you might have an issue with the power converter, when you are plugged in it makes the DC voltage when you unplug it should switch to battery power..
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