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Subject: Resistor on 8N

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marvin    Posted 02-19-2017 at 13:08:56 [URL] [DELETE]        [Reply] [Email]  
  • Resistor on 8N
  • Someone tell me why my 8N has a resistor behind the dash. It's 6volt. is the resistor needed?

    bruce    Posted 02-19-2017 at 17:53:27 [URL] [DELETE]        [Reply] [Email]  
  • Re: Resistor on 8N
  • It's there because of the construction of the square coil. As Jack said, it can not handle the current while the tractor is running. But, you need more current to start the car. The ballast resistor does that, just as Jack said. Forget and leave the key on with the points closed and you will melt the coil, even with the resistor.

    Jack - Iowa    Posted 02-19-2017 at 13:19:30 [URL] [DELETE]        [Reply] [Email]  
  • Re: Resistor on 8N
  • Short answer: YES!

    That is the ballast resistor. When cold it's resistance is very low allowing essentially full battery voltage to reach the coil, thus insuring a hot spark for starting.

    Within a few seconds of running the resistance increases and reduces the coil voltage preventing coil burn out.

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