Electronic ignition diagnostic

Hook a meter to coil + and turn key to run. You should have about 6-10V.
Crank the engine using the KEY and read meter while cranking. You should have "same as battery" and should have at least 10.5V, 10V absolute minimum

There is a problem! Between a good ground and the positive side of the ignition coil, got 5.95V While cranking, got only 8.5V How this can be explained...