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To add a little bit to Schurkey's response. )
An automobile coil is not really a coil at all. It is actually a step up transformer. All transformers need alternating current (AC) to work. Otherwise if you put the 12 volt DC into them they burn. To DC the coil (transformer) acts like a resistor to ground and gets hot. Where does the AC come from normally when the car is running? It is mechanically created by the points opening and closing.


[Note: This message has been edited by John_Muha]
 
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