Your alternator has two connections in the back of it. A stud that is the output and a spade terminal that is the input to turn it on.

take your meter, engine off, key in run and what is your reading at the stud?
It should be close to battery voltage. If it is then that part is probably good.

Take you meter, engine running, what is your reading at the spade connection (all wires connected)? Should be switched 12V, you may not see it switching unless you have an analog meter. If you have nothing there then you problem is in the input side.

Let us know and we can troubleshoot from there.

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