Does your bike have points ?.... what impedance are these new Dyna coils ? ( Ohms ).
They may be under 1 ohm ( meant for a modern sportbike ). The first one may read 14v because the points are open and no circuit, the 2-3 coil may be in circuit ( points closed ) and pulling the voltage down to 2 volts due to 40 yr. old wiring, switches, fuseholders etc.....or it might be something else