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Farmall & IHC Tractors Discussion Board

Re: Jump starting an 8-volt system with a 12- volt system


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Posted by John T on December 28, 2008 at 06:09:30 from (66.244.97.31):

In Reply to: Jump starting an 8-volt system with a 12- volt system posted by Ireland on December 27, 2008 at 17:48:39:

If you jump it with one cable attached direct to the starter terminal/stud (attach it first) then jump the other lead to a good clean frame ground close to the starter, THAT ENERGIZES AND DRIVES THE STARTER ONLY (provided starter switch isnt engaged) AND WILL NOT BACKFEED 12 VOLTS UP TO THE BATTERY (OLD, AS USUAL, IS CORRECT) which could cause it to blow up so thats how I suggest it be jump started. So long as the battery has enough energy to provide a spark (unless its a mag which dont need battery energy) and all else is correct, she ought to start.

THE WORST AND MOST DANGEROUS way to jump would be by attaching the cables right at the battery top cuz thats where explosive gasses may be exiting and you will create a spark when the last cable is atatched. Thats why they tell you to make the last jump connection at frame ground somewhere far away from the battery

MAKE SURE ITS OUT OF GEAR DUHHHHHHHHHH

JUMP AT THE CORRECT POLARITY + to + and - to -

Im NOT a fan of the 8 volt band aid approach, I suggest EITHER use 00 gauge battery n starter n ground cables and the biggest heaviest highest rated 6 volt battery that will fit in place or else convert to the standard 12 volt system.

Depending on if its a Cutout Relay or a Voltage Regulator etc the tractor 6 volt genny can still charge an 8 volt battery if all is correct although it may not set the world on fire as far as the charge rate.

John T


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