Hello!
In order for the alternator to function in the vehicle, it must have good power and ground connections. Take a test light or DVOM and make sure you have battery power at the large output terminal on the alternator.
When the key is in the run position, you should also have power at the field connection at the smaller plug on the alternator.
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Auto Service Technician
25+ yrs experience as a professional working technician; ASE L1 master technician