1st, my boat is 2000 miles away so I can't check, so I appreciate the help. What size batteries can fit my 1988 30MKII? My survey said a group 21 is bad. No such thing. I called and the old man doesn't remember which is bad. I plan to pre buy my batteries since they are all about 8-9 years old. What is the required starting battery? What size/group are the 2 house batteries? And, will two 6 volt GC2 batteries fit, they are taller than Group 31 but narrower. Thanks for any help.
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