I have observed several incidents where this has happened and it turned out to be the bulb holder. It is easy to replace and you should be able to acquire one at your local MBZ dealership parts dept. that was a former smart Center.Hell to all
I have a 2009 Smart car Fortwo that has a blinker prob. I have installed a new two filament bulb for what I thought was the blinker issue. However the bulb is not blinking but the running light will come on. Any ideas would be amazing.
Darrell from Georgia