Please help Me.."Overcharging"?

I replaced my alternator.
Now keep in mind that my factory one was working right, no problems.
Just the pulley separated, and broke.
But everything was charging properly, just changed it due to the bad pulley that broke.
I just bought one from advance. It is a 60 amp, instead of a 50 amp stock. Thats all they had.
I put up two video clips to show what its doing.
It idles around 17 volts.
And when I hit the throttle, it jumps up to almost 20 volts.
Even causing the radio to shut off when I idle up??
And the turn signals even flicker really fast when idling up, and headlights get too bright.
When I idle down the radio comes back on.
It seems to be discharging according to the dash gauge at idle.
It is way overcharging when I hit the throttle, or even at idle. I didn't have this problem before. Just a broken pulley is why it needed changed.
Please see videos below..

[ame=http://i136.photobucket.com/albums/q172/PghGolden/20130313_135908_zpsd14982b2.mp4][/ame]

[ame=http://i136.photobucket.com/albums/q172/PghGolden/20130313_140023_zpsf675f452.mp4][/ame]



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