If you have 15 V on the coil (+) terminal and 7-11 V on the (-) you have several possible problems.
I"m presuming you took these readings with the engine not running. If you took them with the engine running with an digital meter they are probably not correct unless you have a well shield VOM.
If the points are closed when you get these readings, you should have near zero on the (-) coil terminal and battery voltage on the (+) terminal. If the points are open when you get these readings, you have a short somewhere in the coil. The readings should both be battery voltage.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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