I did use the factory 78 amp alternator, and in going to run the ammeter bypass tonight. I started the car this morning to check the voltage at the back of the alternator, and it was showing 15 volts there. I checked the battery, and it was showing 13.5. I didn't change anything from last night to this morning. Any thoughts on what to check?

1949 International KB-2 "Mater" - 302/T5

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2016 Dodge Durango Limited - 3.6