Brake light out no melted harness
Thread Starter
Newbie
Joined: Feb 2022
Posts: 7
Likes: 0
W204
Brake light out no melted harness
Hi everyone,
I seem to have a some what unique issue.
My 2012 w204 is displaying "left rear lamp out" warning on the dash.
Fine I thought, so I replaced the globe.
Unfortunately it didn't fix the problem. 1 of the 2 brake light bulbs are still not lighting up.
So I did some googling and found its common for the earth wire to melt. I'm fairly sure this is not my problem as the wires and connections look fine.
I've tried different globes, sprayed some contact cleaner and checked connections. Everything seems fine but the single light on the in the left rear light still isn't working?
Any help much appreciated.
Thanks.
I seem to have a some what unique issue.
My 2012 w204 is displaying "left rear lamp out" warning on the dash.
Fine I thought, so I replaced the globe.
Unfortunately it didn't fix the problem. 1 of the 2 brake light bulbs are still not lighting up.
So I did some googling and found its common for the earth wire to melt. I'm fairly sure this is not my problem as the wires and connections look fine.
I've tried different globes, sprayed some contact cleaner and checked connections. Everything seems fine but the single light on the in the left rear light still isn't working?
Any help much appreciated.
Thanks.
Junior Member
Joined: Aug 2010
Posts: 47
Likes: 5
2008 C300
You may want to use a multimeter and an insulation-piercing probe (standard push pin works) to see where voltage is and isn’t. A 06/14/2021 posting (search “rear fog light” on this forum) by antiguangenius on this forum includes a wiring diagram that will be helpful.
Thread Starter
Newbie
Joined: Feb 2022
Posts: 7
Likes: 0
W204
Is this issue common? (1 brake bulb out) it seems very strange to have just one drop out and not both in the same light.
If it is common, what are the common reasons for it to happen?
Thanks.
Junior Member
Joined: Aug 2010
Posts: 47
Likes: 5
2008 C300
https://mbworld.org/forums/c-class-w...ight-swap.html
The overheated connector is a common problem, but the ground pin was the culprit because that pin has the highest current load. I don’t recall reading of tail lamp connector pins for individual lamps failing. If you find that the connector is the problem, applying some contact lubricant may help.
The overheated connector is a common problem, but the ground pin was the culprit because that pin has the highest current load. I don’t recall reading of tail lamp connector pins for individual lamps failing. If you find that the connector is the problem, applying some contact lubricant may help.
