1st... don't worry about the ammeter capacity anymore. Your ammeter will be safe with high output alts since won't read anymore power coming and going from batt because wont be discharged like previouslly did. The stock 78 amps mopar alt is still not the MOST efficient of all but WAY BETTER than the old stock one ( is the one I'm using ) specially with the small pulley they use to come. Ammeter reads what the batt sucks and provides, not what the alt sources,
Now, about the voltage... not everything is on alternator, but on wiring conditions. Did you JUST upgraded the alt without consider the wiring and ALSO ammeter conditions itself? After all these years of abuse over a not correct charging plattform from factory lot of stuff can be affected
Charging system upgradeAlt fields can be connected in either way, so don't worry about that.
Reg must be good grounded.
