Need a little help here please.

Where does the thick wire coming out of this alternator SUPPOSED to go to in our 1964 273 ?
We are replacing the point style with electronic ignition package.
I could swear I took the other end off of the positive side coil,
All the wiring diagrams show it to go to the voltage regulator by way of the ampmeter.
I have hooked the leads up from the new magic box per instructions,
We are not getting fire on this daily driver,20180218_183228.jpg 20180218_183228.jpg