I'm having an issue with myinside lights. They ramdomly go from dim to bright. I have a WFCO 55 amp charger, that goes from 14.3 to 13.2, on a 1 minute cycle. I'm on 50 amp shore power at a campground...
Any auto parts store can load test batteries. Be sure the batteries are fully charged first, even if you have to put a stand alone battery charger on them.
Heck, if you were in TN, I would tell you to bring them to my house. I have a 500 amp carbon pile load tester.
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