Happened in my old Dak, If the bulb isn't seated all the way the metal contact inside housing can melt over time due to high resistance. Not saying this is your case, but you can inspect inside socket to see if something looks different between the other contact.
Other problem could be a broken wire/ circuit somewhere.

 

Stock talilights or aftermarket ones? Year of your D?

IndyD

 

could be a number of things. fuse? relay? wiring?. my old auto tech teacher said that some things like taillights not working, or turn signal flashing fast are a warning for something else. I don't really remember what the "something else" was, but that's my 2¢.



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Stock tailights, 2003. I'll check for melting this afternoon.

 

about the only reasonable possibilities are bad/misinstalled/incorrect bulb, bad ground, or damaged wiring.

Pull all three bulbs out of the taillight assembly and look at them carefully while you do various things (brakes on, turn signals on, etc)? If you see some filaments light dimly when they're not supposed to, or if things go on and off when they're not supposed to, then you probably have a bad ground.

There are no specific fuses or relays for the driver's side stop light?

 

The fuse works the whole system, since you have other lights working, look specific to the troubled side.

 

Sounds like a bad ground. Had that with the Alteezas. If it wasn't seated right all kinds of mishaps occurred. Turns out it was a bad ground connection. Try rotating the bulb around whilst you jam the brake pedal with a piece of wood so you can see the bulb whilst you adjust it.

greg

 

:? Check the bulb socket and make sure the little ear that's on the socket is contacting the grid that's on the taillamp. I have seen many lately that have corroded and aren't making contact. Seems like this is getting to be a common problem.

 

Well, I checked it, I turned it, I cleaned it, and I cussed at it, but it just won't work. I have an appointment to have it looked at in the afternoon.

Thanks for the suggestions.

 

:? So,is it fixed??

 

Yeah, it's fixed. The circuit board was bad so they put in a whole new assembly.