My "new" '74 Duster- or why I need a project like a hole in the head

rapom65 said

Thanks to the write ups you and goldduster318 have made I'm making the move to a Cougar twin fan set up. Found one on Ebay with the wiring pig tails (try finding the harness now days) and ordered up a controller. Need some info on the Tuff Stuff 100 Amp alternator your running. I have a lead on a new black mopar unit that the owner doesn't know any thing about. Any way to ident the 100 Amp unit over a stock 60?

PS. Is your March pulley set up six grove?

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Well, I haven't actually seen a Tuff Stuff 60 amp alternator in person. I went out and took a look at my 100amp, but I didn't see any markings on it that indicated it was a 100 amp. At least nothing obvious I can see with it mounted in the car. The part numbers are even the same except for a single letter between the 60 amp and 100 amp versions. They come with a test tag in the box when they're new that indicates what they tested at, that may be the only way to know for sure.

The march serpentine set up is a 6 groove.