[twitchy]

the last time i experienced this was in an Isuzu Imark. I would signal left and every light in the car would blink too just about.. That or the signal would just stay lit up and i would smell smoke. Turns out a squirrel decided to snack on my wiring harness....

point is, look for critters in your car or signs of them (hair, nests, baby squirrels, etc)

and check your wiring harnesses out. Its not going to be a small job but it makes sense- the signal lights current and the current going to your temp gauge for instance have absolutely nothing to do with each other- unless the 2 respective wires are frayed and touching (or melted together or whatever, you get it?

that just made me think too- given what i know, i would reccommend you start looking in behind your instrument cluster, take it out and look around in there before anything else, cause they share a wiring harness.....Good luck