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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