Is it a stock setup?
Assuming you have a working ammeter, does it show the correct charging level?
Unless you are taxing the alternator with charging dual batteries, extra off road lighting, or have a camper with batteries, 85 is good.
I used to have the model number of the AC Delco alternator that put out something like 100+ amps, was going to use it to charge the batteries when I towed a fifth wheel.
But that was another life....
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