Posted by Janicholson on October 23, 2022 at 16:49:27 from (24.240.46.228):
In Reply to: Farmall B - No spark posted by joelu on October 23, 2022 at 16:16:12:
The most frequent issue with no spark is that the points under the distributor cap have corroded just enough to not allow them to pass current for ignition. The remedy (first fix) is to use fine emery paper to polish them. This is followed by cleaning them with a folded dollar or other bank note. these are lint free and will clean the freshly polished contacts. if no joy, make sure they are opening correctly to .020inche. Next it is necessary to determine if there is voltage getting to the points. A test light (auto store) that works on 6 or 12 volts will help this. With the clip of the test light attached to shiny metal, the bracket holding the coil will do well, touch the small coil terminal not connected to the distributor. this should show voltage by lighting up. If the points are closed, there will be no voltage on the distributor side of the coil. If a piece of a plastic spoon is between the points to insulate them, there should be voltage there as well. If no voltage or light at either side of the coil, the ignition switch or a wire ic likely to be the issue. This site sells ignition switches if it is bad. (out is run, in is stop) and If you are totally out of the loop on how to do this watch a video on installing points. You should not change the condenser. It is likely just fine. Do not leave the ignition switch on for more than 3 or 4 minutes if it is not running. To get points or other components of the distributor, use the info on that riveted on plate on the body of the distributor. It is not a standard distributor made by IH so points for that model tractor will be wrong. Jim
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