Re: What's up with these 8N coils????!!!!

Posted by TheRealRon on August 30, 2004 at 06:38:49 from (69.179.5.42):

In Reply to: Re: What's up with these 8N coils????!!!! posted by Gary Clark on August 29, 2004 at 19:48:37:

Hope that does it for you. Some advice: if you are going to be working on old tractors, get a service manual with wiring diagram for it and get a DMM and learn how to use it. Radio Shack has nice ones for cheap.

With a little electric knowledge and the DMM, this could have been solved in a matter of minutes. Basically you test for voltage across the coil with the engine running. If the tractor has a ballast resistor (or should have one per the wiring diagram) you should see about 4.5v at the coil (about 9v for a 12v system). If no ballast is present or called for, you should see a full 6v (or 12v) at the coil. I.E.: with the switch in the "S" position, you should see full battery voltage at the coil; when the switch is in the "I" position, you should see the ballasted voltage at the coil. Ballasting is usually done to allow the engine to start more easily in cold weather... full voltage gives you a hotter spark and makes up for the affect of cold temperatures on the battery.

Having said all that, if you have the engine tuned on the money and don't live above the Artic circle, the ballast can be removed and a coil marked "for use without external resistor" can be substituted. I think you can still get such a 6v coil at NAPA or Tractor Supply, etc. This is a bulletproof solution as there can be no mismatch between coil/ballast.

Let us know how it turns out.

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