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Old 02-16-2006, 06:57 PM
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Join Date: Nov 2005
Posts: 18
300D domelight

So the domelight in my 300D (Betsey) hasn't worked since I got her 8 months ago. The rear reading light works from the switch on the dash and when the door is open (only the rear door?). I replaced the fuses when I got the car, but no go. So I got a new bulb, and still nothing on any setting.

What's a good way to check if there is power to the plug that goes into the fixture itself, before I go track down a replacement?

Thanks in advance.


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Old 02-16-2006, 07:44 PM
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Join Date: Mar 2005
Location: SoCal
Posts: 660
The red wire(s) on that unit should have power all the time. Test if the red wire has power. Use the brown wire on that unit as ground. Since your rear dome light is working you can eliminate the fuse. They use the same fuse.
'85 300D Cal 280,000 miles
'07 C230 37,000 miles
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Old 02-16-2006, 07:50 PM
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Join Date: Jul 2004
Posts: 7,335
Your dome light does not have a switch to turn it on and off on the dash- only the light itself if it's a w123. Please post the year/chassis to help others solve your problem.
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Old 02-16-2006, 07:59 PM
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Join Date: Nov 2005
Posts: 18
sorry about that

of course you need the year and model to give me any help--and I'll get it on my signature as well.

1984 300D Turbodiesel

You're right -- there is a switch on the dash for the light in the rear only, and a switch on the light fixture itself for the front dome light.

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Old 02-16-2006, 08:42 PM
ImBroke's Avatar
Diesel way of Life
Join Date: Jun 2004
Location: Cleveland, NY
Posts: 2,215
A cheap digital multimeter will help you a lot. you don't need anything fancy, and remember, if you don't read any voltage the first time, check your ground.
05 Mustang GT Vert (3) 101k
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Old 02-17-2006, 12:45 PM
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Join Date: Nov 2005
Posts: 18
Thanks all -- I'll give this a shot next week!

I don't have a multimeter, but I have a battery tester with a ground clip—that should show if there is current, right?
1984 300D Turbodiesel
running biodiesel

Seattle, Wa
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Old 02-17-2006, 01:20 PM
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Join Date: Dec 2004
Location: Albany, OR
Posts: 4,845
You might check the door switches too. Mine dome didn't work when the doors were open. I took the switched out and cleaned them up and they work fine now.
'04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold
'77 300D ~ Sold
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Old 02-17-2006, 11:39 PM
sailor15015's Avatar
Reverse lights! Score!
Join Date: Apr 2005
Location: Norman, Oklahoma
Posts: 1,184
My seatbelt warning buzzer was weak and extremely annoying so I unplugged it. Right after that I discovered that my front dome light would only come on when the passenger side door was open, not the driver's side door. I didn't make the connection for about two months. I plugged the silver box back in and back came my lights.


1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo
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