Alternator replaced and now car won't start

A week ago the voltage light came on when I turned on the overhead light while the car was running. I stopped the car for a couple hours and it started right up, but for the next fifteen minutes of the drive, all the electrical components begin to drain and I had to turn everything off to have enougth power in the headlights to see. The next morning the car didn't start. I replaced the alternator and charged the battery and it still didn't start. I replaced the battery and checked the charge, still no start. When I turn the ingnition key, the fuel pump buzzes and I get one click. I have cleaned what I can of the corrosion off the battery terminals. Any suggestions?

Check ground at engine. Check all pos. connections. If you can use an ohm meter. Check fuses!
Hope this helps, Kev

I would check the connections at the starter. If their ok, then i would remove the starter for testing. AutoZone does it for free.

I would start by seeing if the battery is fully charged and not charged with just the alternator,then I woul double check the + battery cables(2)for internal corrosion (a very common problem),and then go after the starter,Good Luck.