You're only getting 0.6 volts to the coil? I assume that reading was taken with the coil connected? The coil itself may be shorted. Those Magnum coils are notorious for failing here in the rust belt. Salt causes the coil laminations to rust, and as they rust, they expand. Eventually, the laminations expand to the point they crack the epoxy encapsulation of the coil. At that point, water gets into the coil and shorts it out. Carefully inspect the coil for cracks.