Electrical question: batteries

mmfan55

Member
I have a big cube high compression U Moline. With a 925 amp group 31 battery it would barely crank. I added another 850 amp battery and hooked it in parallel to the 925. Very little help. Last week I decided to try running both batteries direct to starter solenoid (both positive to starter) spins GREAT. Why the difference between this?
 
Less resistance in the double cables. I would recheck your original cable for resistance or possibly corrosion under the insulation.

Sometimes connecting the ground cable to a starter mounting bolt or the clutch bell housing helps too.
 

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