Quote:
Originally Posted by eskimo
The threads I've read about the bulb in the headlight switch claimed that, at least for the W123 chassis, it's to indicate when the rear fog light is turned on - a rear fog light that isn't present on cars built for U.S. consumption.
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That's correct, pulling the switch out one click turns on the fog lights (with low beams on). Pulling the switch to the second click would turn on the rear fog light (and the switch indicator light). On U.S. cars (without rear fog lights) the indicator light does not do anything.