On my 88 300e the rear dome light does not work. Fuses and dash switch both are good. I recall reading that there is a wiring connector (X-18??) and that it is in or near the rear passenger door, but I wanted to be sure before I started taking things apart. Could someone tell me if there is a wiring connector and where it is located? Thanks.

BTW, I used this holiday weekend to replace a defective cruise control switch and instrument cluster, and I wouldn't have ever attempted it without the help available from this awesome board. My sincere thanks to everyone who takes the time out of their own busy days and evenings to share their knowledge and thoughts with those of us amateurs who wish to learn a little bit about how these machines and parts work and tackle repairs ourselves.

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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)

Didja check the domelight switch above the climate control?

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Fourings

84 Audi Coupe GT with Turbo engine, EFI (buh-bye CIS), Jamex seats, Koni's/H&R's, e-code lights. 210k and counting.
1992 Anthracite 400E, 161k, "Grey Ghost".
1986 VW Quantum Syncro, 192k, gone to the crusher in the sky.
1989 300TE 172k. (Was mine, now also Mom's car)
72 280SE 4.5 (Mom's car)

Yes, front is fine, but the rear doesn't illuminate.

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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)

I am curious how you checked the switch. Just because it illuminates doesn't mean it is working. And you said nothing about checking the bulb, the most likely cause of the problem. Anyway, pry out the housing, check the bulb, and check for voltage at the contacts.

The switch on the center console controls the rear dome lights. It has three positions if memory serves, and one position won't allow the rear domelights to come on at all. Are you sure it is in the right position?

__________________
Fourings

84 Audi Coupe GT with Turbo engine, EFI (buh-bye CIS), Jamex seats, Koni's/H&R's, e-code lights. 210k and counting.
1992 Anthracite 400E, 161k, "Grey Ghost".
1986 VW Quantum Syncro, 192k, gone to the crusher in the sky.
1989 300TE 172k. (Was mine, now also Mom's car)
72 280SE 4.5 (Mom's car)