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Ford 9N, 2N & 8N Discussion Board

'43 9N Ignition coil resistor


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Posted by Herb on May 31, 2001 at 13:13:41 from (206.135.208.82):

I have a question regarding the resistor coil that feeds power to the ignition coil. For years an old guy used to help me when I had problems but now he is dead and he had bypassed this resistor. My 9N is very difficult to start when it is cold and I started to investigate why because I want the thing to run just right. I looked at the schematics of the tractor and realized this resistor is supposed to be connected. I wired the tractor as per the schematic and would only get occasional spark on each plug. I put a meter on the wire after the resistor and only had 2 volts. I called the local Ford tractor place and they couldn't tell me what this resistor does. Does any one know? I bought a new resistor and installed it thinking it should let 6 volts through. If I by pass this resistor the spark returns consistent and the tractor starts right up without any choke.
Do I need this resistor? Why did the old guy bypass it? I also get times when it will just cut out for a few seconds and die if idling it will stay running if it is at least half throttle.

Also If the key is on at a point when the points are closed this resister coil gets red hot and the voltage drops to 2 volts on the coil side.

Is it supposed to get hot? What will happen without it? Could the Ignition coil be bad?

It ran for years with this resistor bypassed. And was even jumped with 12 volts at times.

This tractor is in supberb condition with a dearborn highlift unit.

Any help would be appreciated!





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