I've tried to narrow down the problem by swapping the bulb, swapping the assembly & swapping the big black light relay in the relay box. Apparently no current is reaching the plug for this bulb. After reading the wiring diagram in the Haynes manual, the only other thing that I can think of is the headlight switch. Does anyone have any suggestions. The offending light is on the left (driver's side). Thanks in advance, as always.

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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)