On the 06 chevy colorado I recently bought the left side turn signal bulb wont flash when I hit the turn signal colum, right side works perfectly fine. The bulb will turn on and stay on it just wont flash on the front left side, but the rear bulb will. I replaced the bulb and it didnt change a thing, I checked the fuse box and the fuse was good still. I tried to snug up the fuse box bolts and those where mostly snug and no difference after that. This weekend I plan to take a look at the wiring with a friend, is their anything I should try or take a look at before this weekend anyone can think off?