Last week my left turn signal just quit working in the headlamp but the rear & side mirror still work fine I had a warning for a turn signal malfunction for about an hour then it just stopped showing.. turn signal never worked again after that I was thinking maybe one of the three ballast connected on the back of the headlight may have gotten wet and shorted only because it happened a day after a really bad rain storm any help would be greatly appreciated

Welcime to the forum! The only suggestion I can give is to post this in the general W205 forum as well because they have a larger audience - a lot more owners posting break/fix threads there. This issue is probably not C43 specific. Please include specific type of headlights on your car.

Probably running low on fluid on that side

That stuff really works??
good on pancakes too?

Sorry I’m a jerk

Bollocks! Not a jerk Sir