Well ah..hmm we are not allowed to discuss automotive modifications here. That is one of site rules. For such questions try one of the other electronic boards. But you will be free to discuss any other topic in this forum. That do not come in conflict with the TOS http://www.allaboutcircuits.com/l_tos.html
As to6afre mentioned, any "automotive modification" topics are not allowed on these forums according to paragraph 6 of the Terms of Service. I will further advise you to abandon your idea of modifying your turn signals, as you could easily wind up with a hazardous/dangerous situation.
If you simply feel you must attempt it against all logic and reason, you will need to go elsewhere.
A short list of suggested forums is in this thread: http://forum.allaboutcircuits.com/showthread.php?t=54400
But even with advice from ANY forum, your project is very risky.