"rotten egg smell" is often used to describe overcharged batteries. you might want to do a sniff test in the battery compartment(s) to eliminate that from the possibilities.
Been there done that, and it does smell like rotten eggs. My antique univolt was asking to be replaced and it was.
cheers, bill b.
__________________ 1962 Airstream Tradewind
2001 Ford 7.3 Diesel
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