Sarcasticly saying......with the wild ammeter fluctuations (from negative to positive readings), be on the lookout for the ammeter to burst into flames or to melt down taking associated wiring connections as well......wildly fluctuating ammeters are not to be trusted......ooopps....wrong thread.....
The REAL QUESTION IS: WHY would the OP choose a rebuilt GM style altetnator (of Chinese? origin), in lieu of Mopar? Beside mounting and alignment issues, the early GM units used a external mechanical voltage regulator, Model 10 and later MODEL 12 units and ultimately the 10 SI and 12
SI, WITH SI meaning SYSTEM INTEGRAL (built in regulator using the internal diode trio and regulator for rotor power source and output voltage regulation). A Mopar to Mopar alternator replacement is a, in popular vernacular, a "no brainer" decision. Why go looking for problems that don't need fixed. Unless, the auto parts counter person doesn't know the difference and just wants to make a sale. Just talking out loud......
BOB RENTON