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This isn't *really* enough information to work with. Number one, is it a wagon or a sedan? The wagon's tail lights are wires and metal, where the sedan's tail lights are conductor printed onto a plastic sheet. So, here's what I would do in a nutshell.
For giggles, check out the holder. Specifically look in the hole in the ba k (while the bulb is still mounted) to make sure the two pins go up and touch the two bulb contacts. If they seem ok, remove the bulb and use a pen or a multimeter probes to push the pins farther up... Then retest to see if that's done the trick.
If you happen to have a multimeter (preferably digital, but analog should work too) with DC Volt and Ohm (Or continuity) settings, you should be able to do some troubleshooting of the electrical system.
If you have a sedan, check for voltage where the connector plugs into the circuit board. After checking for voltage, I would disconnect the assembly and check it for continuity from there. I have *NO* experience with the three row (late model) tail lights, but I know the brake line is the driver-sidemost wire on the driver side of the car on the older two row configuration. I would get that wire color and look for it on the other side. Otherwise, you'll have to figure it out. A hint that the chassis is the common.
If you have a wagon, the connectors are VERY simple. I don't know the wire colours, but checking for voltage between the common (or the chassis) and pins on the brake light holder while the light switch is in the middle position will tell you which line is the parking light. After that, the brake line becomes obvious. Check for voltage between the brake wire and the common, and if there is voltage, disconnect the brake wire and check for continuity.
If there is no voltage, check the wires running between the two fixtures. On the wagon they are in plastic tubes where the spare tire is. On the sedan, they are behind the tire jack (I think) or under the carpet. They are much easier to get to in the sedan. Another place to look is where they join, and I'm not exactly sure where that is, but I think it's the driver's side.
If there is voltage but no continuity, check out that holder.
If you're sure holder is kosher, check continuity between where the brake wire connects to the fixure and the three pins where the bulb holder connects. If none of the pads that the holder contacts has continuity to the brake line, you'll need to remove the fixture and examine that trace. If you DO get continuity, do the same check vurses the common/ground line. If there's no continuity, you'll need to remove the fixture and examine that trace.
Hope this helps both of you gentlemen. I would enjoy hearing whatever solutions come to bear.
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89 760 GLE 150k/ 86 740 GLE 240k -- Still going.
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