03 taco altezza taillight left blinker problem

I just installed euro altezza taillight for my 03 taco but everytime i turn on the headlight the left blinker automatically turns on with it also. And the worst part is that the left blinker doesnt blink anymore. How do i fix it?

Hey, check out old posts there are answers to this question there... funny though cus I have had the same problem. Seems like the wires on the left side are crossed and needs re-wiring.. I have had a hell of a time finding somone who will touch it but finally found a guy at a body shop. Good luck! I dont know enough about splicing wires to do it myself.
EC