I search around on the forum and could not find any answer to my problem.
On my 97 e420 only one of my front fog lights works. I have checked the buld ( switched) and also tested them and they both are ok.
what is wired is that the driver side works all the time but the passenger side does not work expect when it's humid, or when its raining. At least when it's humid it works 50% of the time. When dry/ sunny weather--- never works.
I know this is wired but that's what I have observed. and I think its very strange.
I have checked the wires by the bulb and there is no voltage there. while there is voltage on the drivers side.
The fuse is ok aslo.
On forums I read somewere that there is a relay by the battery!?!?! That might need to be dried.
Vehicle: 2000 E 320 4Matic, '03 (50th anniv.) Corvette, '00 Land Rover Disco II, '85 Chrysler LeBaron Conv't
Location: Connecticut
Posts: 210
My 2000 e320 had the same problem....it was my passenger side fog light that intermittantly worked, along with both of my side marker lights...
i noticed that they NEVER worked after i went through a high pressure car wash....weird
but i had just gotten my entire passenger side fog light assembly replaced, so i brought the car to the dealership and they simply put in new bulbs...and i haven't had a single problem since (it's been a little over a month now...)
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Front Fog Light, Lits Problem ----Wired 
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