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Re: Ford 8N ignition issues

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Author  [Modern View]

03-15-2013 14:37:03

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As JC said, that linkage runs to your governor, then back to the carb.

As for the wiring, the diagram isn't much different from 9N/2N and early 8N.

They all used the front mount square coil.

That's where the confusion with the resistors comes in.

The best way to know for sure is to measure the resistance of the coil and resistors.

What you're shooting for is about 3.5~4 amps of current when running.

7.5 volts on a running(charging) 6V battery/(1 ohm 6v coil+1 ohm ballast resistor) = 7.5/2 = 3.75 amps.

If you put a 12 volt battery in there (~14V charging) and left the 6 volt coil,
you would have ~7 amps of current and would melt your coil.
That's why you add the ceramic resistor, to reduce the current with a 6V coil.

But you said you used a 12 volt coil.

If you went to a 12 volt coil, the internal resistance is higher than the 1 ohm
6 volt coil, so the extra resistor is not needed, but the ballast resistor is.

The ballast resistor, when cold, has almost NO resistance so you

get a boost to help start the tractor when cranking.
As it warms up, the resistance goes up and limits the current to the proper level.

That's the difference between using the original ballast resistor and the ceramic one.

Hope that helps!

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