1996 Plymouth Voyager alternator not charging

I'd make sure the battery has a full charge, the battery cables/ wires all clean and tight on both ends.

I realize your talking about the charging system, but, check for trouble codes. You cycle the key, on--off, on--off, on, you just turn the key till the dash lites come on, no further. Then the check engine lite goes to flashing, you count the flashes to get the codes. I believe this vehicle does have two digit codes for the charging system. Or if the codes point in a different direction, you can go that way.

If you have a digital volt meter, we can check your charging system?

Do you have a theft system?