ok so I went over everything and it looked and tested fine. so I popped on the new alt I picked up as a spare and bingo right on spec! played with the wires and conections and it stayed steady. odd! well I will try it like this for a bit and see what happens hope it is fixed!

When I restored my 74 Rallye I went through 7 bad alternators from Advance Auto. 4 were stripped castings though. After I went to NAPA and got a good alternator I still had an intermittent ground on the voltage regulator. Symptoms were overcharging from the alternator.

Check battery to body, K-frame, engine and firewall ground. I tried to keep the paint pretty on the firewall and run dedicated ground wires. It didn't work out so well. I finally cut the paint and left the dedicated grounds. Now it works.

all is well now with the new alt. I probably have the best grounded third gen charger in north America! I have been over every ground on the car. so far so good

you know i had a similar problem twice and one time it was the alt and i had used two new ones. it had a short, i'm still always leery about my alt so i always keep an eye on my alt gauge. JZ.