BRuby
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Can charge both at the same time but best practice is to disconnect ESS negative and charge/desulphate separately as needed. See link below for more info.Does anyone know if connecting a Battery Tender to the positive and negative terminals on the main battery keep both batteries charged? Or do you need to isolate the auxiliary battery to charge it? I have a 3.6 engine with ESS.
https://www.jlwranglerforums.com/fo...battery-consolidated-information.25377/page-6
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