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Tractor Talk Discussion Forum

6v battery size for an m

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glennster

10-02-2006 07:33:45




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what is the size number for the 6v battery on a farmall m. i have a little battery in there and its about due for a new one, want to get the right size one for the tractor. thx glenn




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John T

10-02-2006 09:38:32




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 Re: 6v battery size for an m in reply to glennster, 10-02-2006 07:33:45  
Glen, to start an M at 6 volts, I would use the abslolute biggest highest CCA rated unit that will physically fit into the battery compartment. Some people are going with the new AGM type batteries like Optima or Lifeline makes. Also, be sure n use 00 Gauge Battery n Starter n Ground cables to reduce voltage drop.

John T



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K-Mo

10-02-2006 08:10:21




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 Re: 6v battery size for an m in reply to glennster, 10-02-2006 07:33:45  
In general, the orginal battery for an M was a Group 2. The Group 1 was used up through the H and the Supers used a Group 3.
One thing to look for is the CCA (Not CA) rating. The minimum CCA for a Group 2 battery is 585CCA. Most of today's batteries will exceed this minumum. Shop around for the Group 2 battery with the highest CCA rating.
Also, when using the 6 Volt system, use heavy gauge battery cables such as 1GA. Using the discount store 6 or 8GA cables won't do the job.

K-Mo

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Red Dave

10-02-2006 08:06:59




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 Re: 6v battery size for an m in reply to glennster, 10-02-2006 07:33:45  
Generally, the answer is: the biggest one that will fit in the holder or box.

Measure the battery box length, height, width, depth etc. Buy the battery with highest cold cranking amps (CCA) rating that will go in there.



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