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Farmall & IHC Tractors Discussion Forum
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Jumping 6-Volt with a 12-Volt Question

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David Kronwall

10-09-2006 03:03:59




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Yesterday, I joined a couple of friends for one of their association tractor rides around Caledonia, Illinois. Beautiful day, great ride. I drove my friend's M, while he and his friend both drove their green. Lester said to me, "Ask your YT friends about jumping a 6-volt tractor with a 12-volt...what do they say about that?" He didn't think it could be done without burning up elements in the 6-volt system, and yet, a friend of his had done it to one of Lester's green tractors without any bad effects.

So, on Lester's behalf, I'm asking. What is the general feeling about jumping a 6-volt system with a 12-volt. How advisable is it? Thanks in advance. David

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Doug in Illinois

10-11-2006 12:46:48




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 Re: Jumping 6-Volt with a 12-Volt Question in reply to David Kronwall, 10-09-2006 03:03:59  
I agree with everyone who says direct to starter. I have done it sometimes on the Ford 861 powermaster back at the farm in Nebraska. But, make sure of the battery polarities. The Ford is positive ground, most 12v uses negative ground. Why not convert to 12v, I did on the 861 after a fuel fire burned the wiring. You will need to get a resistor to feed the coil/distributor, change lights, but the 6v starter SHOULD handle 12v just fine. Sure makes it easier to start.

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gene bender

10-09-2006 19:58:06




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 Re: Jumping 6-Volt with a 12-Volt Question in reply to David Kronwall, 10-09-2006 03:03:59  
Not a good idea batterys can blow.



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F-Dean

10-09-2006 15:10:20




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 Re: Jumping 6-Volt with a 12-Volt Question in reply to David Kronwall, 10-09-2006 03:03:59  
I believe it would work with less danger on a tractor with a Mag. Attach the appropriate (+ or -) to the ground and touch the other cable to the post on the starter. This would turn it over without feeding 12 volts into the 6-volt battery.



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WFT

10-09-2006 10:50:05




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 Re: Jumping 6-Volt with a 12-Volt Question in reply to David Kronwall, 10-09-2006 03:03:59  
THE VR WOULD BURN-UP.



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tasbrus

10-09-2006 08:29:55




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 Re: Jumping 6-Volt with a 12-Volt Question in reply to David Kronwall, 10-09-2006 03:03:59  
I agree, Do not hook your cables to the battery.



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LEE

10-09-2006 06:40:54




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 Re: Jumping 6-Volt with a 12-Volt Question in reply to David Kronwall, 10-09-2006 03:03:59  
I'm surprised to see folks on this board recommending a post to post hook-up under any condition. This is downright bad advice. If the 6 volt has a shorted cell or other internal problem it can explode with some serious consequences. As with many things you can get away with it. But maybe not.



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Bob M

10-09-2006 05:49:52




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 Re: Jumping 6-Volt with a 12-Volt Question in reply to David Kronwall, 10-09-2006 03:03:59  
Hey David - I've successfully been jumping 6 volt equipment from 12 volts almost since 12 volts was "invented"!

As the others point out below, the trick is to minimize the time the two systems are connected. (Ie. hit the starter first, then make the final jumper connection. And disconnect the jumpers the instant the engine fires).

A couple other tips:

1 - ALWAYS OBSERVE BATTERY POLARITY!!! Disregard system ground polarities, etc. Just remember to connect battery + to battery +, and battery - to battery - and you'll be set.

2 - If you are jumping off a modern vehicle(with computer-controlled fuel injection), recommend shutting the engine down before making the jumper connections. This minimizes the risk of frying the ECU (= expen$ive!) from voltage transients during the jumping process. It also reduces the jumping voltage a bit, lessening stress on the jumper cables, the 6 volt starter, etc.

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John T

10-09-2006 05:42:57




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 Re: Jumping 6-Volt with a 12-Volt Question in reply to David Kronwall, 10-09-2006 03:03:59  
David, Sure its been done with no ill affects (if you mean jumping where it gets to the battery) as you say BUTTTTT TTTTT TTTTT its been done and batterys blew up n spewed acid also !!!!! !!!!! So you sure you wanna take that chance????? ?

There is one way thats farrrrr lesssss ss hazardous, however, as noted below which is to jump THE STARTER MOTOR ONLY on its post which is after n down stream from the starter switch and its hot input side thats connected to the battery via that big cable.

Its jumping the battery thats the MOST hazardous I DONT RECOMMEND THAT.

John T

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tasbrus

10-09-2006 04:47:22




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 Re: Jumping 6-Volt with a 12-Volt Question in reply to David Kronwall, 10-09-2006 03:03:59  
I've also done it many times but I hit the starter button first and then connect the 12v directly to starter and remove it as soon as possible. Never had any failures from it.



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Bob

10-09-2006 04:11:27




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 Re: Jumping 6-Volt with a 12-Volt Question in reply to David Kronwall, 10-09-2006 03:03:59  
The general concensus is to jump the 12-Volts to the starter ONLY. MAKE DARN SURE it's out of gear!

Even a weak 6-Volt battery will provide enough current to operate the ignition system if relieved of cranking duties.

Jumping it that way eliminates POSSIBLE ignition system and charging system damage.



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IaGary

10-09-2006 04:00:44




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 Re: Jumping 6-Volt with a 12-Volt Question in reply to David Kronwall, 10-09-2006 03:03:59  
scot

I've done it for years and never had any ill affects.

Don't leave the cables on very long.

Get it started and pull them off.

Gary



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IaGary

10-09-2006 04:02:02




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 Re: Jumping 6-Volt with a 12-Volt Question in reply to IaGary, 10-09-2006 04:00:44  
Excuse me, David not scot.



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scotc

10-09-2006 03:57:48




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 Re: Jumping 6-Volt with a 12-Volt Question in reply to David Kronwall, 10-09-2006 03:03:59  
Don"t walk away to let the dead battery charge like on a 12v-12v jump. Minimize the time and if something burns up it was probably getting ready to let go anyhow. That"s how I see it.



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