Weird electrical problem. Please help
I had a similar weird problem where the left front turn signal was dim at all times and when the parking lights were turned on it would burn brightly and make the other parking lights and marker lights all go out.
Thankfully I read this thread first though. Didn`t even know the front turn signal lights had separate grounds! The right side was fine but for some reason the left front signal light had no ground wire at all, completely missing. So I made up my own little one to ground the light out and then everything instantly worked great. It pays to read up on the forum to save alot of time.
Big E