Why Lights Dim Left Side Only?
 

During the day today, a friend who followed me in my 1992 W124 Wagon told me that the left brake light and left turn signal light, (driver's side), are very dim when activated, but the center and right brake light and right turn signal are normal. I haven't looked at the front lights to see if either side is dim too, as I wanted to check here first to find out this is a common, "easy" fix, or a major problem, before I start doing a complete test of every light in the car. As always, all thoughts/suggestions are appreciated.

1962 MB 220SEb "Fintail" Sedan
1963 Vespa Motor Scooter VNB4T
1992 MB 300TE 4Matic Wagon
1995 Subaru Legacy AWD Wagon

Sounds a little like a ground issue. Pull the left assembly and check it out.

The left and right also have their own fuses. I'd check to see if you have a dirty fuse or possibly a bad connection there.