My E320's bulb out light is lit. I did a walkaround, and the left front corner light and left rear taillight are out.
Since I just had this problem on the right side, I thought it must be a corroded/bad fuse just like that problem.

The left corner/tail fuse isn't blown, and the holder doesn't appear to be corroded. I swapped the #3 fuse (R corner/tail) with the #8 fuse (L corner/tail)—no joy. Swapped them back, right side lit up, left side still dark.
Checked all the bulbs first thing, all good.

Any ideas, folks?

__________________
RIP:
2011 E350 BlueTEC, Schwartz 81k (totaled by uninsured drunk driver)
1964 Unimog 404.1 (wrongfully towed by the city)
1994 E320, Brilliantsilber 208k (transmission shuffled off after sudden catastrophic fluid loss)
1982 300D, Silberblau under a blue repaint 256k (sold for parts)
1995 E320 Polarweiss, 131k (sold for parts)
1995 E300D Polarweiss, 287k (totaled by drunk driver)

Just had this same taillight problem on my son's 1988 300ce. Replaced the headlight switch in the dash and all bulbs now work properly.

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87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)

Can you swap illumination warning relay modules with your other 124 as a test?

Sixto
87 300D

Richard: that very well may be it, my headlight switch is all floppy inside.

sixto: I bet I can! Having two of the same chassis sure is nice. Do you know offhand where those relays are located?

__________________
RIP:
2011 E350 BlueTEC, Schwartz 81k (totaled by uninsured drunk driver)
1964 Unimog 404.1 (wrongfully towed by the city)
1994 E320, Brilliantsilber 208k (transmission shuffled off after sudden catastrophic fluid loss)
1982 300D, Silberblau under a blue repaint 256k (sold for parts)
1995 E320 Polarweiss, 131k (sold for parts)
1995 E300D Polarweiss, 287k (totaled by drunk driver)

It was the headlight switch. Thanks for the help, y'all!

__________________
RIP:
2011 E350 BlueTEC, Schwartz 81k (totaled by uninsured drunk driver)
1964 Unimog 404.1 (wrongfully towed by the city)
1994 E320, Brilliantsilber 208k (transmission shuffled off after sudden catastrophic fluid loss)
1982 300D, Silberblau under a blue repaint 256k (sold for parts)
1995 E320 Polarweiss, 131k (sold for parts)
1995 E300D Polarweiss, 287k (totaled by drunk driver)