Emergency!!!! Alternator not charging and I am in the middle of a drag & drive!

[Clelan]

The wiring from the ignition run to the voltage regulator field junction (goes to 1 side of the field and jumps to the voltage regular blue wire) melted to ****. I noticed it because I went to swap let's in my carb and there it was. Fortunately I was close to home so I grabbed a known good alternator and voltage regulator from a running driving daily driver truck and swapped them on to my car. I replaced all the melted wiring right to the junction point with the ignition run wiring. I also replaced the wiring plug on the voltage regulator because I had one.
I didn't have time to properly diagnose, So I shot the parts cannon at it but it still does not charge. I have 12.24 v at the battery, 12.12 v at both sides of the alternator field ehen running. It does not increase with RPM. What am I missing? What voltage should I read at either side of the field terminals?

Cley

 

[Clelan]

Amp meter is bypassed. I tried a ground jumper to the alternator case, no change. I tried a ground jumper to the voltage regulator, no change! Measuring voltage with high quality volt meter at battery and Autometer volt meter in dash. Both are matching.

Cley

 

[Clelan]

Yellow wire ran to replace melted wire. Tried connecting it directly to battery, no change.

Cley

 

[Dana67Dart]

Based on your description you have an isolated field alternator.

One field terminal gets 12v, one get a variable ground from the VR

Is the doner alt and VR both isolated field parts?

If so the VR body MUST be grounded and a 12v source attached to the (blue?) wire to the VR

The green wire from the VR goes to one of the alt field terminal.

Another (typically blue) wire goes from a 12v source to the other field terminal on the alternator

 

[Clelan]

I figured it out! The parts store Voltage Regulator plug did not make contact with the pin for the green wire on the voltage regulator. I stole the plug from my other car and I'm in business!!

Cley