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Sorry I am sure this has been talked about, but I cannot find it. Which deep cell or marine battery at Cosco is the correct number to get for the Sunrader???

Hey All, I am busy on many fronts in my 86 Sunradar. Put in a WFCO 8955 Converter/Charger, but I have not been running the Sunradar this winter and both batteries are suspect so I put both on a charge. The charge seemed to take and I thought I was in business. We were able to to check all the connections in the panel to get it set up, the lights worked off just the battery for the first time since I have owned her (since Sept.). I wrote earlier about the isolator, didn't end up getting it but did get a new circut breaker (right next to the isolator on the inner fender), that seemed to get the power moving thru the isolator and onto the coach battery....success. So the new power generator is in and we are having great thoughts, well we woke up the next day and both batteries we dead again. Now I don't know if the converter has a short and is draing both batteries or if they are both suspect and I should just get new batteries and go from there. I have had the voltmeter on both and when they were charged I got 12.4 but then both have gone under, I charged them again, the truchk battery came back to 12 but the coach battery is toast and won't come back from the dead. I will take some pictures soon of the interior, I am five shades of blue, all the windows have been taken out and re-sealed, new louvered shades (blue), new fabric covered the cornices (valences), new privacy curtains bed over the cab, all the doors taken off in the coach and masked and repainted blue glossy, the project is coming along!!! I just about have it pretty enough, that the wife will get in it!!! I know I rambled sorry, should I just get two new batteries and start from there?? Thanks, Redbeard