farmall batteries

Try a Group 26 Battery. I believe that is what I used in my 140.
GOOGLE "battery group" and look at the group size charts.
K-Mo
 
Measure the box, and take a ruler to autozone, carquest, walmart, wherever you can see the battery to measure it.

If you're talking your 766, group 3EH I believe is the proper 12V size for it.
 
We just changed them all out for group 31"s like in my semi. That way when I change batteries in semi the good ones work in the other equipment. Also will need less cable cleaning with just the stud sticking up.
 
I'd enlarge the battery holder and but in a bigger battery. I'm using a 12V one that is as long as the std 6v but double the with.

All starting problems went away and they lasted 5-6 years.

Eliminating the extra connections really helps
 

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