if it reads 13 to 14 while running that would imply charging.

BUT the field readings are bad.

the one that should read 12 volts also feeds the ballast resistor and the sensing line to the voltage reg.
you must have 12 volts or close to it for the balast resistor, so my bet is you have a break in the line somewhere.

check at the vr sensing line and the balast resistor for voltage.

the second field wire is from the vr to the alt. it will be some diminished voltage. but since you aren't getting anything to the other, it is a little suspect.