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Allis Chalmers Discussion Forum
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Jump starting a CA

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tmil

02-21-2008 18:12:12




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What damage, if any, will I do jump starting a 6 volt positive ground system with a 12 volt battery




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2t2@ia

02-21-2008 18:53:41




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 Re: Jump starting a CA in reply to tmil, 02-21-2008 18:12:12  
When I need a 6 volt battery for jumping or for my electric fencer, I have on occasion picked up a used one. When an implement business replacees a pair of 6 volts in a tractor or combine, frequently, one of the pair is still good enough for that type of use. Often they will trade one for a junk battery at no charge. I go to their stock of old batteries with my tester and find one that is "good enough".

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tmil

02-21-2008 18:28:32




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 Re: Jump starting a CA in reply to tmil, 02-21-2008 18:12:12  
Thanks Old for the reminder, but fortunately I did not have a 6 volt battery installed. Tim



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old

02-21-2008 20:52:06




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 Re: Jump starting a CA in reply to tmil, 02-21-2008 18:28:32  
Now if your tractor has a mag no problem using a 12 volt battery to start it. If it has a distributor then you can burn out the coil if you run it on 12 volts instead of 6 volts. Starter will hold up a long time on 6 or 12 volts. Most of my tractors are 12 volt with 6 volt starters on tem and have been that way for decades

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tmil

02-21-2008 18:26:14




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 Re: Jump starting a CA in reply to tmil, 02-21-2008 18:12:12  
Thanks DickL, I find your comments very helpful as I have just begun with the Allis collection for me and my grandson. We have 2 B's and a CA. Tim



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Dick L

02-22-2008 07:30:58




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 Re: Jump starting a CA in reply to tmil, 02-21-2008 18:26:14  
Heres what I use. 660 amp cold crank with 1700 max amp.

third party image

This is my third one. The first two was Sams Club jobbys. Only two starts to the charge after a year. Never again for me. The cheap ones just don't have the staying power



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DickL

02-21-2008 18:39:37




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 Re: Jump starting a CA in reply to tmil, 02-21-2008 18:26:14  
As Old said, I do always hook to the starter. I put the black on the starter wire and the red on the starter lock stud.



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old

02-21-2008 18:23:08




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 Re: Jump starting a CA in reply to tmil, 02-21-2008 18:12:12  
Be very careful hooking up a 12 volt battery to a 6 volt battery. If you do the wrong thing it can/will blow up in your face. Only safe way to jump it is if you can hook right to the starter but never battery to battery. Seen to many people loose there eye sight doing that



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DickL

02-21-2008 18:16:05




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 Re: Jump starting a CA in reply to tmil, 02-21-2008 18:12:12  
None. That is the way I start most of my 6 volt tractors. As soon as it starts get the jumper off. I use a rechargable jump start unit that has a 1700 amp max.



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