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Subject: No fire 8n

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Victoria    Posted 07-14-2019 at 18:59:38 [URL] [DELETE]        [Reply] [Email]  
  • No fire 8n
  • We have completely new wires, pertronix coil, pertronix electronic ignition,ammeter. Gauge , ignition switch, ballast resistor. This all on a12 volt tractor. And it still wonít fire. ????? Iím not even getting any movement on the ammeter gauge. I have it wired as the instructions on the myfordtractors.com said.
    Any help greatly appreciated. It was running and died while brush hogging. Did the same thing last year
    And I bought a new electronic ignition and then it started right up, but not this year. I donít understand it

    Jon Rhee (RI)    Posted 07-16-2019 at 09:57:22 [URL] [DELETE]        [Reply] [Email]  
  • Re: No fire 8n
  • Check for a short to ground at the point where the primary wire enters the distributor. This has had me ripping my hair out for a couple weeks.

    Bruce(OR)    Posted 07-14-2019 at 19:40:48 [URL] [DELETE]        [Reply] [No Email]  
  • Re: No fire 8n
  • Generally if your running the 12V system, you don't need the ballast resistor.
    That coil should be marked "Internal"resistor". Is it?
    Voltage meter is now in need. Ground to ground and chase the voltage going into the switch, out of the switch and to the coil, Does it?
    As your running a 12V system, I might start with a known good 12V coil with built in resistor if all checks out.


    K.LaRue-VA    Posted 07-14-2019 at 23:16:36 [URL] [DELETE]        [Reply] [Email]  
  • Re: No fire 8n
  • If they have a ballast resistor this is probably a front mount engine. The front mount engine does need the factory ignition resistor with the "12 volt" coil. To my knowledge there is no 12 volt replacement coil for the front mount that does not need the external resistor.

    Electronic ignition on the front mount engine needs two wires going to the distributor. One from the ignition resistor to the coil, the second wire is direct from the switched side of the ignition switch for the module.

    The ammeter usually won't show anything more than maybe a small wiggle when the switch is turned on. If you have headlights switching those on should show more than a wiggle.

    The electronic ignition modules should last much longer than a year so I suspect replacing the module last time maybe inadvertently fixed some other issue like the coil terminal not making good contact in the distributor. Just removing and reinstalling the coil can make or break that connection. There are other things like the copper strip in the distributor that can cause no spark condition.

    I have no clue if the pertronix module can be tested other than having two good ones and swapping them when there is any question.

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