Welcome to the Forum!
Start with the grounds on your camper (clean, corrosion free?) Then go to fuses and relays, don’t just look at them, test the fuses with a NON LED test light. Then pull them and look for any indication of heat or damage. If in doubt replace them ONE AT A TIME!, this will allow you to determine where the problem is/was.
Regarding the converter, determine what make and model you have, then Google issues with _______ converter. Someone else has had the same problem and figured out a solution. Electrical gremlins suck but if you take your time and start with a plan they can be figured out.
When you determine what the problem and solution is, make sure you come back and explain it here, it may help someone else in the future.
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JOHN
People Sleep Peacefully in Their Beds at Night Only Because Rough Men Stand Ready to Do Violence on Their Behalf
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