I would not mess around with the old battery anymore if it was mine. I would replace it with a AGM.
You might get it to work ok now but it will let you down again very soon and you will have to do all this work over again.
Just replace with a new AGM and install a knife switch like sugguest above.
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2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor
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