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Electrical question: batteries

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Author  [Modern View]

07-11-2018 11:06:00

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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?

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07-12-2018 06:31:29

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 Re: Electrical question: batteries in reply to mmfan55, 07-11-2018 11:06:00  
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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07-11-2018 16:57:08

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 Re: Electrical question: batteries in reply to mmfan55, 07-11-2018 11:06:00  
What gauge cable & how long are they? Running 2 cables doubles the flow to the starter.

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07-11-2018 19:00:25

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 Re: Electrical question: batteries in reply to EarlyB, 07-11-2018 16:57:08  
Number 2 or larger. 5 ft

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