Tail lamps on my 300D 2.5 are acting up, and I can't figure it out. On the driver's side, all lamps are lit normally except one of the bulbs is out. On the passenger side, all bulbs light, but dimly. When I depress the brake, all the passenger side lights go out. There is a bulb out light on the dash, of course.

Bulbs are new. Fuses are new. Checked the ground from the passenger side tail and cleaned the contacts. Bulb holders are not original, but I know I was at least getting the bulb out on the driver's side with the old ones.

Any ideas where to start looking? I guess it must be a problem with the wiring before the bulb holders - but that doesn't narrow things down much. Maybe the pin connectors, from the car to the bulb holder? I don't know - I'm clueless on electrical stuff. I do have a multimeter though - is there a systematic way to track this down?

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