Please help Me.."Overcharging"?

That's "fair" but you probably have SOME v drop

Put one meter probe on battery POS post, and the other on the blue alternator field wire. Turn the; key to "run" with engine off. Read the voltage, and you are hoping for LESS than .3V (three tenths of one volt) Any more means you have drop in the ignition harness. This voltage ADDS to the regulator set point. 1/2 volt, example, will take a properly operating voltage regulator at 13.8--14.2 and add 1/2 volt for 14.7.

I should have mentioned, also, to check charging voltage WARM if you did not. The regulator is someone temp. sensitive.

Next make sure of your regulator GROUND, which works the same way as harness drop, IE voltage drop across the ground path ALSO adds to the regulator voltage.

To do that, start the engine, run at a simulated "low cruise" RPM, and make the following check with all loads OFF, and then with heater blower, lights, etc, ON.

Put one probe of your meter on battery NEG post, and the other stab right into the regulator flange.

Once again, you are hoping for NOT MORE than .2V, and zero would be perfect

It's back again!! Ugh!!
I thought it was fixed! I was fine for a week at 14.5 volts.
I went for a ride today, and after about 4 miles.
I noticed my radio shut off, and I looked at my factory gauge, and it was pinned over to the right, overcharging.
I pulled on my headlights, high beams, and radio, blower, wipers, to calm it down to make it home.
I got home, put my digital meter on it. It read 17.10, and fluxuating up and down like nuts.
And then all of a sudden dropped to 14.20, and was fine again...

I stuck the one end of the handheld digital meter into the POS side of the battery, "car off", "ignition on", and the other end to the blue wire at aleternator.
It is reading .07 volts. I guess that blue wire is bare somewhere??
It is crazy. It will be fine and then throw a fit and overcharge. Am I onto something with this blue wire being at .07 now???
Also...do I put the black or red end on the digital gauge on the POS battery post?