Your car is older so it didnt have the fog light in the rear. They started doing that in the early nineties (wiring us and euro cars the same so that the rear fog light will turn on).

The orange dot will illuminate if you have rear fog lights hooked up and they turn on. There is another bulb on like that 87 300es that lights up the outside bezel to show what position you are in. I havent checked the W123 cars yet. Someone let me know on that?

I was thinking of wring up rear fog lights, but I couldnt find any of the same contact connectors for the rear. I might spend the time some day, but for now, I dont want to run the wires from the front to the back.

Austin

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Current Stable:
1994 S500 v140, 210k miles, white with grey.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold (rumor has it, that it has 750k miles on it now)
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 "300E" Amg Hammer 88k mi sold (it was really a 200, not even an E (124.020)
1992 500E 156k mi sold
etc.