Peggy,Could a closed battery area (no ventilation) just above the holding tank be contributing to a sulfurous smell?I assume the gases given off by charging have to go somewhere.
I don't THINK they're your culprit. A wet dirty bilge is a dark stagnant swamp that can generate the same malodorous anaerobic gasses as a holding tank.If your bilge appears to be clean and dry, look for trapped water in that area.But first, check the tank and fittings for any leaks.
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