Welcome to
Fiberglass RV. While we specialize in trailers that have molded frame-less bodies, instead of panel on wall-frame construction like your FunFinder, the systems inside them are mostly similar.
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We've taken a few trips this summer. One dry, [b]the rest with hookups.
Or should I take it to Batteries Plus and have them test it?
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I would have the
battery tested. If you have a standard lead/acid wet cell battery,
and don't have a "smart charger" as part of your trailer's converter, then every time you camped with hookups, you were pumping more charge into an already charged battery, which possibly boiled all of the distilled water out of the battery. I ruined my 1st battery just this way.
Until I replace my original converter with one that includes a "Charge wizard" smart charger, I pull the main battery fuse whenever I am camping with hookups.
Good luck!