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Old 10-10-2004, 10:06 PM
Coming back from burnout
Join Date: Jun 1999
Location: in the Pacific Northwest
Posts: 2,274
Question How do I repair the Courtesy Lamp on my 85 300D?

Is it possible to repair the Courtesy Light on an 85 300D? I see a little module with transistors and diodes. Can the Light be fixed?

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Old 10-10-2004, 10:07 PM
Coming back from burnout
Join Date: Jun 1999
Location: in the Pacific Northwest
Posts: 2,274
Presently the Light simply doesnt come on at all...

I forgot to say, presently the Light simply doesnt come on at all...
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Old 10-11-2004, 07:22 AM
tomm9298's Avatar
Diesel and WVO ..
Join Date: Sep 2004
Location: South Carolina NO RUST
Posts: 502
Thumbs up Same Problem

I had the same problem. I checked and had 12 volts at the lamp and it still would not come on. I mean on the lamp!! My fix was pull all connectors off, clean contacts, put connectors back on, insert fixture, all works well!!!
1984 300D Turbo Sedan (Hilda) 272,115 miles.....
Anthracite Gray/Palamino Leather, I am 3rd owner

2001 Dodge Stratus (Silver) (wifes) 55814 miles...

1982 280TE Wagon Astral Silver Metallic/
Anthracite Velour
260,512 miles (Eva)

1969 230 Sedan Olive Green/Black MBTex
4 Speed Manual
84,213 miles ????
Haus Frau

2004 Boreem Ninja Pocket Bike
Highly Modified 49cc (Ling Ling)

Einigkeit und Recht und Freiheit
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Old 10-11-2004, 10:24 AM
Registered Diesel Burner
Join Date: Aug 2001
Location: Northern Virginia
Posts: 2,911
They have a rather weak design for the way that rotating control knob controls the electrical contacts. I disassembled mine completely and tried to clean up the contacts (copper) and bend them a little to make better contact. It was a little better but still flakey.

So, I soldered a jumper across the contacts that cause the time-delayed light turn-off. Now that works solidly. Of course the OFF position doesn't work any more. I can get the light to turn ON in the manual always-on position with a slight bit of switch finesse.

So for me I have my solution with the soldered jumper. I don't need the fully OFF position very often, since I'm not trying to sneak in and out of my car. But if I do then I'll pull the power lead off the light.

[refers to the 1984 300SD]


1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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