changed alternator...wont crank!

odd, maybe the starter solenoid got fried if you accidently arched wires while swapping out alt or just went bad?

also, if they used the massive painless fuse block that goes between battery/alt check that fuse, it would be a big piece of plastic with inline between the two, most dont use it but some do, if it has one it'll be obvious to spot.

Does car RUN if you turn ign. to run position then jump starter sol. to get her to start? Just trying to rule out other wires.

Could also be corroded wires on battery or starter post.