12 volt Optima red top group 25 in a 36 coupe
 

Has anyone used the group 25 Optima red top 12 volt battery in a 36 coupe? I've seen several threads saying an optima will fit in the stock artery box below the floor. I'm converting to 12 volts and am hoping that this will work.

Re: 12 volt Optima red top group 25 in a 36 coupe
 

The only optima battery that will maybe fit inside an original 6 volt hard rubber battery case is the 6 volt optima which is half the size of a 12 volt optima. So why do you need to change to a 12 volt system ? The original 6 volt system is all good as long as all components are in good condition. Are you having some sort of problem with your electrics . Regards, Kevin.