Alternator ratings are like movie reviews on Netflix.....I have gone thru a couple alternators to find one or two that keeps up on each of my cars.

Even called a name brand company after getting the alternator they recommended at over $300 and it did not work like they said. Its all BS the numbers they post from some happy lab equipment...They're excuse was that it was really made for roundy round cars. Yet I told them My exact application before I purchased it and that was the one they recommended....You can't even get good advice from they're own people anymore.

I use full size 100 amp alternators, and I have had mini, and full size, and you never really seem to know until you try it.

Now that I am being too negative, I will go away...But that is the truth of my experiences.