Re: Farmall Cub 6 volt jump started with 12 volt

Posted by Janicholson on September 07, 2005 at 12:50:14 from (199.17.6.175):

In Reply to: Re: Farmall Cub 6 volt jump started with 12 volt posted by EricB on September 07, 2005 at 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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