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There is a good chance the batteries are being charged while connected to shore power. If you can, at least turn the converter circuit / charger circuit off, and verify. You can't go wrong by unplugging the shore power. Stay safe, and don't make any sparks. Unless you have a system that specifically states to disconnect the positive first you should always disconnect the negative first. Isolate it so that it won't touch the battery posts, then disconnect the negative. If you have any load on the 12 volt system, you make see a small spark when you disconnect the positive from the terminal. If the positive is disconnected first, and your wrench touches, or slips and touches, any metal, you will have a dead short and possibly a. Violent arc. Things could go "Boom" as batteries can explode under these conditions. Combine a big arc (spark) with rapid discharge of hydrogen gas, and things will go bad fast. Not to mention the acid expelled by an exploding battery. Best bet is to wear safety glasses with side shields or full goggles. I always have a water hose handy to rinse off if any acid gets in my hands. Reverse the procedure and connect the positive first on the new batteries.. Be careful and everything will be OK.
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Ken & Ara Brewer
2020 Newmar Ventana 3407 DP. (Previous 2016 Newmar Canyon Star 3710 gasser). 2014 V-6 Chevy Equinox Toad.
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