One more thing Randall!
On the lower plug on the Becker, you'll see a connection for the power antenna.....I believe its in spot # 5.......Your wiring harness with the Alpine should probably have a connection for the antenna as well, so cut that wire on the Becker and connect to the antenna wire on your Becker.
The switched power terminal, spot#6 on the yellow upper Becker plug, needs to be connected to your power amp wire on your wiring harness as well.....This will switch the power on to your amp when you turn on your head unit....
I think thats it!