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The following is for older engines that use "points": One side of the coil should be "hot" when the key is on and the other side should be pulsing when the engine is turned over. When the points close, one side of the coil is "pulled to ground". First, check that you have voltage to the coil when the ignition is on and the engine is not running. Second, check that you have a good ground to the OTHER side of the coil when the points are closed. Today's solid state ignition systems are similar, but use transistors instead of a physical switch (points) that needs to be changed periodically. If it's computer controlled, check the diagnostic code.

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19y ago

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