Where exactly are you measuring this?
Do THIS exactly
Clip you meter to coil + and ground. Turn key to "run" and measure coil to ground. It varies should be somewhere between 5- 10V. Now crank the engine using the key and watch meter, read while cranking. You should see full battery voltage less the drawdown from the starter, about 11V. If any doubt, move your meter to the battery POS post and again, read while cranking. The two readings should be substantially the same
