Duhhhhhhhhhh!

Thanks to all for suggestions. In checking to find the problem with the lamp monitor I forgot to check the third brake light inside the car. Changed bulb, problem solved.

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Donwo
1999 SL 500 Sport (30K miles)
1998 E320 (SOLD)
1989 560SL (SOLD)
1987 300E (TOTALED)
1986 300E (SOLD)
1984 300SD (SOLD)