Re: Ford 2N Ignition Coil Circuit

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Posted by Tim Daley(MI) on August 11, 2022 at 04:56:32 [URL] [DELETE] :

In Reply to: Re: Ford 2N Ignition Coil Circuit posted by Phillip G. on August 10, 2022 at 15:50:43:

OK, I'm still at a loss as to what you are trying to accomplish. If you are having a non-starting issue with your 2N and you are using a 12V/NEG GRN setup, all the wiring needs to be verified to be correct beginning with a good battery. Tell us how you are wired. Is the Cutout Circuit removed? Have you certified the distributor is timed, tested, and mounted correctly, and hasn’t a cracked base? Are you getting spark? If you suspect you have a bad coil, try another one. Coils will burn out if the ignition key is left on with the tractor off and points closed. It can melt the insulating tar inside and thus short out when powered up. When the coil cools down, the tar can solidify and may work fine next time starting is attempted. Once the coil gets hot however it may fail again. Have you inspected it for any cracks? You say you have a 12V coil. Did you verify that or just assuming because the box it came in says so? With a 6V Coil and using a 12V system, you need to add a drop down external resistor in the coil circuit. The white ceramic 1-OHM resistor is the common one used but alternatives are twisting two, 1 OHM/10 W standard resistors together, or wiring a diode inline. In the lime-green 8N Service Manual for Dealers & Mechanics, the Electrical Spec Data Sheet is in the back –SEE PIX. The coil lists resistance of the primary and secondary windings. The primary resistance is about .5 OHMS. Your standard VOM won’t measure the 5800 OHM setting on the secondary. If coil seems to meet the static test as stated, but no spark and coil to distributor tests good, then I’d say your problem is in the distributor then.

From Bruce(VA):
Bottom line.......coils do go bad, but I'll venture a guess that 75% of new N coils sold today are sold to folks who do not understand how to diagnose a poor spark problem or how a coil works. So, for those who don’t know any better, in a no spark situation the first suspect is usually the coil……and, more often than not, it isn’t the problem.


Tim Daley(MI)

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