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Farmall Cub 6 volt jump started with 12 volt

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Hanbert

09-07-2005 11:24:20




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Well i finally joined the cub fraternity of owners yesterday. Bought a nice little 48 cub. Bought it on e-bay, at my wifes urging. not very far away, so went to pick it up, and it won't hold an idle and run, probably bad fuel and in need of a carb rebuild. The guy we bought it from decided to hook it up to his 12volt truck and jump it. Guess what! no ignition after that whatsoever. My question is this: Besides the starer switch and starter, possibly the points, what else could have been burnt? He had it running off the jump at one point. Generator, wiring, volt regulator all at risk? He's rebuilding the starter as we speak, just want to make sure we check out all the possibilities. thanks, Pete

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W.K.TEDDYBEAR

09-09-2005 08:09:25




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 Re: Farmall Cub 6 volt jump started with 12 volt in reply to Hanbert, 09-07-2005 11:24:20  
WHEN JUMPING 6VOLT POS. GROUND FROM 12VOLT I HOOK THE NEG.TO THE CABLE STUD ON ON SWITCH/SOLENOID AND TOUCH(NOT CLAMP) THE POS. CABLE TO GROUND WHEN SWITCH/SOLENOID IS ACTIVATED.WAS TAUGHT TO DO THIS WAY BY AN UNCLE. NEVER HAD A PROBLEM AS STARTER IS DRAWING POWER WHEN IT IS TOUCHING.



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gene b

09-08-2005 03:33:10




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 Re: Farmall Cub 6 volt jump started with 12 volt in reply to Hanbert, 09-07-2005 11:24:20  
Jumping 12v to 6v battery is not cool. Maybe he has never seen a battery explode. If a CUB will not start with 6v something is realy bad somewhere.



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mthomas

09-07-2005 14:08:24




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 Re: Farmall Cub 6 volt jump started with 12 volt in reply to Hanbert, 09-07-2005 11:24:20  
I use a 12volt battery in my 51 cub all day points no problem the 6 volt starter will handle it just fine it turns over faster just dont leave the ign. switch on when it is not running.



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Bigdog

09-07-2005 12:15:20




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 Re: Farmall Cub 6 volt jump started with 12 volt in reply to Hanbert, 09-07-2005 11:24:20  
Like Eric, I can't believe that the starter itself was damaged. You need to separate the start circuit from the ignition circuit and see what you have. If the starter cranks over but it doesn't fire you may have burned the points or damaged the coil, especially if the coil was an original 6 volt one. If I were you I'd get my tractor away from this guy before he does any more damage and troubleshoot it logically to see what the problems are.

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EricB

09-07-2005 11:32:49




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 Re: Farmall Cub 6 volt jump started with 12 volt in reply to Hanbert, 09-07-2005 11:24:20  
Actually jumping with 12v is a common custom. That's not to say its the best route but I did it for years before converting my W4 to a 12v system. Yes the starter will eventually suffer, but it will take a long time. As long as you don't hold the power on the starter for more than a second or two no real damage should occur.



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Janicholson

09-07-2005 12:50:14




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 Re: Farmall Cub 6 volt jump started with 12 volt in reply to EricB, 09-07-2005 11:32:49  
I have done it (not a great policy, but expedient).
My first method eliminates the exposure of the 6v battery to 12v. To keep sparking away from the tractor battery, connect the positive post of the fresh 12v battery/vehicle to the tractor's battery cable coming from the positive battery post. (this means :at the far end of the cable not the battery end. It might be the ground strap location if Pos. ground on the tractor, probable.) Then connect the negative jumper to the Fresh battery/vehicle.
The next step is the key to this action.!!!
Put it in neutral, set the brakes,turn on the key, then forcefully touch the other end of the Neg jumper to the starter side of the heavy switch on the starter, or solenoid. The starter now spins with no connection to the 6v battery at all. If the tractor battery is completely dead, or internally open, this method will not provide coil ignition spark. Mag ignition does not care. If the tractor system is negative ground(not likely) hook up the negative fresh battery/vehicle jumper to the tractors ground point as described above.
OR!!!
With all accessories/lights off, touching the negative jumper clamp to the battery side of the solenoid, or heavy switch will provide this voltage, but someone must be trying to start the engine with the key/button/lever/push rod, to make the starter turn. This last description is not recommended by me, as it does place 12v across the 6v battery.
Always maintain control of cables and clamps.
Never use 12v the first way for more than 15 seconds.
Never use the second way more than 5 seconds. If it does not start something else is wrong with it.
JimN

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