From too high to too low just by doing...

...nothing!

Very frustrating.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

maybe the multimeter is giving intermittent reading.
I had one that would give high or open ohm readings
because lead was almost broken 1 strand holding.

I plan on working on mine, today or tomorrow. My adjustable regulator came in the mail yesterday, while I was at the PRI show. I am still trying to recover from the show (great, but very tiring), so don't know how high the ambition meter will be, today.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

As per the chart from this thread, 13.3 is normal when warmed up.

And FYI, I've been running a big Nippondenso alternator of a Dakota in my '66 Polara for 2 years now with a stock (70-up style) regulator. I'd converted that car to a modern square-back alternator and regulator first. Then I dropped in a 100A Chrysler alternator and mounting brckets (the fan on the alternator was as loud as the radiator fan!). And finally I replaced that with the ND (which very neatly fits inside the 100A alternator bracket with just a little metal link to connect it to the adjustment slier). No voltage problems, ever.

The voltage regulator doesn't really care which alternator its controlling. It senses the voltage and throttles back the alternator field current appropriately. If it has to throttle back further for a ND than it does for an original square-back Chrysler at a given RPM, it does so seamlessly.

If you're seeing 15+volts, my hunch is that you've got a bad regulator, or the regulator is sensing its control voltage at a bad point in the electrical system. Ideally, there should be very little resistance (few connections, big wires) between the +12 pin on the regulator and the battery positive post.

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Maybe some commented on this and I missed it, but has the quality of the ground at the regulator been checked on any of these with high voltage problems?