I need help!!!

[hottweelz_gp]

I have a 90 GP, not a turbo, but you guys know your stuff:
I just replaced headlight and foglight bulbs and the hood slipped out of my hands and slammed (kinda hard) from that point on, my volt gauge is showing only 9.5-10 volts and the dashboard lights are dim, the headlights are prery bright, but I definately see the voltage loss, did I just kill my alternator?  Is this just a coincidence? (it's always sat at 13.5).... or is it the battery that could've taken a hit?   I put on the headlights/foglights/A/C, and etc, the gauge DOESN'T drop below 9 volts, but if I rev the engine it DOESN"T increase over 10 either!  My car sits at a train station as we speak :(   :cry: