Having trouble starting model A

[Stac]

I have a 1929 model A that used to be my grandfather's that I got to start once, and haven't been able to since. The starter is turning the motor, but I'm not getting any voltage from the ignition coil.

The wires heading leading into the coil are reading 6V, and I've tried 2 coils other than the original, as well as a replaced the wire leading to the distributor, but still can't get any current through going to the distributor.

Anyone know what could be wrong?