I have a 2003 C320 that recently started having multiple lights/bulb(s) not working issue.

The front left turn signal (drivers side) will not work, replaced bulb, no luck. replaced with another new bulb, followed by a new socket and new bulb & no luck. The rear right brake light (passenger) also quit working. I replaced with a couple of new bulbs & will no longer work. I have not tried replacing the assembly yet.

One of the license plate lights shows warning at times- maybe idiot light only comes on if lights are on? and I have a parking light (running light?) in the front now not working, the passenger side light- I notice it no longer illuminates when I lock the car. I have checked the fuses next to the steering wheel & all seem fine. - unfortunately not marked as to their function that I could find.

Any other ideas? Do any of the items have any ties to one another or coincidental random occurances? The biggest issue is the brake light, followed by the turn signal....

Thanks in advance for any ideas you may have as I really would like to avoid taking it to the dealer.

 

if it's the fuses in the end of the dash there should be folded index to the function of each fuse in a slot there

 

How old is the battery

 

the front turn signal is a ground problem, unless your car has already had that update done. and there is a repair harness that fixes it. it comes with a new socket and harness that youll ground to the body.

the rear brake lights...make sure the brake lights are the top lights..and the parkiing lights or running lights are the 2 bottom bulbs.. inner and outer. then make sure you have the correct bulbs in there.. there was a wire harness update some years back on the rear tail lights too. usally its a wrong bulb issue.