I bought a 1995 C280 over a month ago now. I've been driving it everyday and absolutely love him. My problem right now is that his right turn signal only works 10% of the time and I can't figure it out. When I turn right the switch will move to the correct position and everything, but the indicator doesn't light up and the relay buzzes. I took apart and inspected the relay and the same part on it works for the left signal but buzzes for the right. So what I'm assuming is that the relay is warning of an issue elsewhere.
I don't think it's anything to do with the right lights themselves because they always work if I turn on the hazards.
if anyone has had this issue please give me a shout, I'm completely stumped and winters coming here in Canada so hand signals will be hella brisk.
thanks

 

The system only consists of the stalk, the relay or the front SAM----if you don't have the diagnostics, change em all or I guess you live with it!

 

Does a relay buzz when it's broken or when something else is? I've been wondering for a while

 

I dealt with this same issue for some time. Since your lights work when you hit the hazard switch then it is likely a faulty combo switch stalk (turn signal lever/wiper/hi/lo beams) just like mine. My '95 C280 required the part that included the harness. PM if you need guidance on replacement. Replaced mine and everything works now.

 

Ggw