left turn signal

When it is blinking fast in the morning, leave the turn signal on and check to see which light if any is not blinking. If either the front or rear light is not blinking, they will blink fast to let you know that there is a problem. I have noted bulbs that will make contact when warm but not when cold. It may be as simple as replacing the bulb or you may have to replace the bulb socket.

check grounds as in the am condensation may cause bad contact there fore a fast blinking signal check and clean all conections only other thing to check would be the multi function switch may hay an internal problem no way to repair switch just replace with aftermarket just as good as oem but cost less