966 batterys

the 6 volt batterys when bad on my 966 do to age and a bad voltage regulator so i put in two 12 volt batterys two pos wires going to the starter and two grounds put a new regulator on i hope this works
 
the two 12 volts are wired in parallel which you have but its not necesary to run two cables right to the starter. you can connect them in parallel with short cables to each battery, then run pos. to starter and neg. to good ground.
 
That will start with one good 31 group battery in the 1000 amp range. We start our 1466 in the winter with the same one battery set up. Get the stud top version and cut the cleaning issues to near zero.
 

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