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'43 9N Ignition coil resistor

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Herb

05-31-2001 13:13:41

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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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Paul M. La Fave

10-01-2004 14:15:20

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Re: '43 9N Ignition coil resistor in reply to Herb, 05-31-2001 13:13:41

I always thought that resistor was in place to reduce the spark coil input voltage during normal run time. The resistor was switched Out of the CKT during START so the Coil would have Maximum Spark at Start when it really needed it. The resistor was switched back in the coil ckt after the Key switch was released from the spring loaded Start Engine Position. If the resistor burnt open the symptom would be Engine starts but dies as soon as the start key is released.

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JAMES D. BELDON

08-10-2004 04:33:55

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Re: '43 9N Ignition coil resistor in reply to Herb, 05-31-2001 13:13:41

ON AN INBOARD 6 CYLINDER MERCRUISER. HOW TO WIRE A RESISTER TO THE COIL AND DISTRIBUTER. I KEEP BURNING COILS AND I AM TRYING TO CORRECT THE PROBLEM.

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a 1943 9N is a 2N (ED-illinois)

05-31-2001 19:29:43

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Re: '43 9N Ignition coil resistor in reply to Herb, 05-31-2001 13:13:41

just thought you would like to know

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ED - Illinois

05-31-2001 13:21:39

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Re: '43 9N Ignition coil resistor in reply to Herb, 05-31-2001 13:13:41

my '46 2N also had the resistor bypassed sending full voltage to the coil. I understand from Dell this is a miseducated mechanic's way of curing a weak spark. The 6volt coil is not designed to accept full voltage. Sending full 6 volts to the coil often results in a fried coil, as it did with me.

Do yourself a favor and wire it correctly and replace the coil. Sounds like it is your problem.

By the way, the resistor is suposed to drop the voltage to something like 3.8 volts at the coil.

Make sure all your connections are clean, bright, and tight.

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TimK

05-31-2001 14:15:45

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Re: Re: '43 9N Ignition coil resistor in reply to ED - Illinois, 05-31-2001 13:21:39

Ed is right on. 6v to the resister and 3.5 to 4v at the coil, points closed. If the points are open, it will read a full 6v. All your connections have to be clean and bright for the 6v to operate properly and I would consider replacing the ignition switch, since those things are notorious for bad connctions after they get old. As long as you are replacing the coil, you may want to consider pulling the distributor and giving it new points and condenser and rotor. And by the way, that resister will get hot. My $.02

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