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rotorwrench · 05-13-2023, 04:57 PM

Check between the two small terminals with an Ohm meter. It should about 1.5 Ohms give or take a little. If not then it may be damaged. The coil is basically an electromagnet when it is connected to a battery. It won't induct a high tension response unless the ground side it disconnected such as is accomplished by the breaker points. On the car, the points have to be closed to energize the coil. If the points are open, touching a test light to the ground terminal will complete a circuit and the test lamp will light up due to the ground lead on the test light. A coil that is bad with an open in the primary will not function.

05-13-2023, 04:57 PM	#5
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,491	Re: no power at coil Check between the two small terminals with an Ohm meter. It should about 1.5 Ohms give or take a little. If not then it may be damaged. The coil is basically an electromagnet when it is connected to a battery. It won't induct a high tension response unless the ground side it disconnected such as is accomplished by the breaker points. On the car, the points have to be closed to energize the coil. If the points are open, touching a test light to the ground terminal will complete a circuit and the test lamp will light up due to the ground lead on the test light. A coil that is bad with an open in the primary will not function.