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Farmall & IHC Tractors Discussion Forum
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Which Batteries To Use in 756 Diesel?

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migraine

03-26-2008 20:27:57




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Have a 756 Diesel with 4300 hours that I am second owner of and currently has two 6 volt batteries hooked in parallel. This baby does not start good even with hot charge and fuel shut off set in prime position. I thought that these came with 12 volt batteries hooked in series from the factory but I was wrong once before so..... What are you guys going with on these series tractors? Will 24 volts for starting purposes hurt anything electrical on the tractor? It just does not seem to spin the motor fast enough when it is cold even though it is always stored inside.Thanks Migraine

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sd pete

03-27-2008 04:32:58




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 Re: Which Batteries To Use in 756 Diesel? in reply to migraine, 03-26-2008 20:27:57  
I don"t know anything about a 756. But my 806 and 856 had 2 6 volt batteries wired in series.I did try 2 12 volt batteries in parallel and i couldn"t tell any difference.



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Allan In NE

03-27-2008 04:17:34




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 Re: Which Batteries To Use in 756 Diesel? in reply to migraine, 03-26-2008 20:27:57  
Ouch!

You don't suppose that maybe someone wired 'er wrong and has damaged that starter in the process do ya?

Either way, 6 volts or 24 volts is not good.

Allan



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K.B.-826

03-26-2008 22:01:09




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 Re: Which Batteries To Use in 756 Diesel? in reply to migraine, 03-26-2008 20:27:57  
I think you've got the whole series vs. parallel thing backwards. It wouldn't even crank with two 6's in parallel. 24 volts will fry every electrical part on a 756. In a series conection, the negative cable of one battery would be hooked to ground, and the positive cable of the first battery would be hooked to the negative terminal of the second battery. The positive cable of the second battery would be hooked to the starter. In a series connection, the voltages of the two batteries adds up, so with two 6's in series you get 12 volts, while the cold cranking amps do not double. In a parallel connection, the positives of the two batteries are connected and the negatives are both grounded. The voltage of the two batteries equlaizes, so the result of two 12's is 12 volts. However, the cold cranking amps doubles. Two 6's in series was factory on the 756. The advange of a series connection is that the reserve capacity of the batteries is greater, meaning you can crank for a longer period of time. With a parallel connection, you get a short burst of high amps. Those old diesels need long periods of steady cranking to build heat, so stick with two 6's in series. Check out your cables, they need to be very heavy. 756's are known for being cold blooded, so plan on plugging it in for a couple hours.

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Chuck46

03-26-2008 20:36:21




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 Re: Which Batteries To Use in 756 Diesel? in reply to migraine, 03-26-2008 20:27:57  
Migraine, I like the two six volts better than two twelves. My 756 has 10,000 hours and starts well done to about 30. I would make sure the starter and batteries are in good shape, then I would be suspious of the injection pump. How does it run? I wouldn't play around with 24 volts. Good luck, Chuck



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migraine

03-27-2008 07:38:08




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 Re: Which Batteries To Use in 756 Diesel? in reply to Chuck46, 03-26-2008 20:36:21  
Sorry guys, my bad. They are two 6 volt hooked in series. It was dark and I thought they both were hooked to the starter but not so. I always take the cables off when charging them. Hope that is the right thing to do. I think after turning this thing this morning that the starter needs to be rebuilt. It probably has cranked over a lot in the years. I will also take in the batteries and have them tested for good. Thanks

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Janicholson

03-27-2008 11:22:30




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 Re: Which Batteries To Use in 756 Diesel? in reply to migraine, 03-27-2008 07:38:08  
A starter draw meter is cheap. they are just placed next to the cable and tell the amp story. If it is drawing over 600 amps, I would suspect starter bushings. JimN



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