Crazy question:

Has the brake light wiring been mucked with? any of the wires damaged? On some cars I've seen, the tail-light wiring passes under the side plastic panels in the trunk. Maybe one of yours is getting wet somehow, or maybe the wires have been crushed? Something to check.

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My first Mercedes Benz. 4/6/07.

1984 190E (201 024) 2.3L four.