i didnt know where to post. so i figured id try here first, something has been up with the turn signals since my dad installed them a while back. i got a video of it for you guys. sorry i talk akward when it comes to talking to a microphone......anywayzzzz if anyone could help me i would love them forever! Mustang turn signal help? - YouTube
Whenever something isn't right after some work is done, you have to go back and check the work. You'll have to follow a diagram and trace the wires. The first and easiest thing to check, though, is the flasher relay. I'm thinking its a short though. I had a similar problem on my truck.