Best option code-breaker I've ever seen!!!! (and I've checked out a lot, from vintage sites to Aussie sites) Thank you..............

Edit: red switch is emergency flasher. red "button light" is aftermarket or dealer install (I think; my SD lacks this). The factory alarm arms whenever you lock driver's door with key.

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)