Plato 5 Posted December 18, 2018 Share Posted December 18, 2018 Hi, I must admit to electrikery not being my strongest subject Recently I replaced the House battery with a larger one (85 to 105ah) I carefully photographed all the wires, tied the common ones together, and then connected the new battery exactly the same way as the old one. Only trouble now is that the new one won't charge as it did in the old installation. I can get the new house battery to charge if I connect it in parallel with the starter battery (jump lead to +ve posts) I have two independent battery switches and can't link in parallel in case of an emergency (I have jump cables on board just in case, but far from ideal) I therefore want to provide a fixed parallel battery switch, which will also be a hack for charging as I simply can't find the problem. Attached is my understanding of the boat's wiring, and in blue the proposed parallel switch. Please can someone who knows more about this than I, look it over and advise if there are in errors in my understanding or thinking And maybe comment on why the new battery won't charge as in the past. All comments will be most appreciated! Boat wiring diagram.pdf Quote Link to post Share on other sites
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