so I took my 08 civic to the body shop to repair a fender. Somehow they managed to screw up the turn signals. They work fine when the headlights are off, but when on, the left turn signal light in the dash stays on and when the turn signal is activated it blinks really fast. ..???

 

One off the signals wire is ground, check those wire first.

 

Take it back to the body shop? They messed it up.

 

Ok I'll check the ground wire.
The body shop won't fix it they say they didn't touch the left side of the car, and problem must have been there before. (they suck) also the side that they fixed was hit before so they cannot "guarantee" any work.

 

Also I noticed today that when I unlock the car with the remote the left turn signal flashes along with the brake lights.
And the thought that the problem was only when the headlights were on, but it's not. The radio flashes with the turn signals.

 

Ok so it's fixed, thanks for the help. Turned out someone put a different plug on the turn signal. Shoddy connections, which probably caused a poor ground.