Put your test light on your coil "+" terminal with ignition on and if it lights up the points are open, when the points close the light should go off. This test can be done while cranking the engine over or turning it by hand a few revolutions. If your test light stays on that means the points are not making contact (closing) with each other. If the light stays off that means they are not opening.
When the points are closed it creates a ground and allows current to flow thru the points to the ground without any resistance so it's easier for the current to travel thru the points than it is to travel thru the test light which has resistance and that is why the light goes out when the points are closed. When the points open the current travels thru the only circuit which is the test light and it lights up.
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Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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