Turn Signal Modification?

[daytonboi]

I bought some amber/white switch back bulbs. I have a problem though, that I forgot when I ordered them. When my parking lights are on and I turn the turn signal on the parking lights stay lit in the front and don't allow the amber lights to show up all that well. I was wondering if there was a way to change it so that when the car starts to signal the light go back and forth. Thanks for any help.