[sm=WTFsgign.gif]2006 300C has popped the tailight fuse 4 times ????

 

Sounds like there's a short in the circuit somewhere. Start by pulling the bulbs, then put them back in one side at a time to see which side is blowing the fuse. Then examine the wiring very carefully on the bad side to see if you can spot a wear point, or a pinched location or something that might be causing the short. I assume you have isolated the problem to the tail lights, not the brake lights or turn signals. Side marker lights might be on the same circuit so consider them as possible culprits, too. The power for those lights comes in on a black and yellow wire, as a rule, so if you can at least isolate it to one bulb, you could run a substitute wire for that bulb after cutting the bad wire out of the circuit.
It could also be a bad socket.
Hope that helps.

 

Thank You Sir

 

dcotter579: The brake lights work fine turn signals are fine also

 

Is there any water in any of the light enclosures?
Is the fuse the correct amperage?
Could it be related to turn signal use, or high / low beam use? (As in the column switch.)

You gotta make it blow to find it.

 

i'm having the same problem.. Seems to happen while driving in the wet. And then for some time afterward until the car dries out. Was happening last April, then it hadn't happened all summer and now it's doing it again.

The tail lights and front running lights and side-marker lights are out. Replacing the fuse lights the lights for about a half second before the fuse blows. Putting a 40A fuse in doesn't help. The dealer told me that the bulbs were getting old and drawing too much power. But since all the bulbs are less than a year old, I'm guessing I was getting some smoke blown in the direction of my rectum.

You're the 3rd person (including myself) that I've heard of having this problem.

I'm planning on bringing it into my work and putting it up on a hoist and tracing all the running light wiring to find the short. I'm guessing that I'm looking for some chafed wiring.

 

Maybe the OP has found their problem because it doesn't look like they ever came back with an answer, but my problem ended up being that the harness for the license plate light was routed incorrectly and was resting on the muffler, which caused it to eventually break the two wires and then the power and ground wire corroded together. So a little snip of the wire to get rid of the corrosion on each end, a couple of wiring butt-connectors and some shrink-wrap and all the lights are working again. Oh, and I re-routed the harness behind the heat shield so that it won't come to rest on the muffler again.