Rear dome light wiring

1965 - 1972: 250S, 250SE, 300SEb, 280S, 280SE, 280SEL, 280SE 3.5, 280SEL 3.5, 280SE 4.5, 280SEL 4.5, 300SEL, 300SEL 6.3, 300SEL 3.5, 300SEL 4.5
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Rizz280s
C Class
Posts: 36
Joined: Wed 17 May, 2017 11:45 am
Model you own: w108
Region: Western Australia
Location: Perth

Rear dome light wiring

Post by Rizz280s » Mon 02 Jul, 2018 11:56 pm

Hi all (again),

I have a short between the rear dome light and the rear dome light switch. My question, what path does the live wire run from the switch to the dome light? Where is it most likely to be shorting?
Pulling out the dome light, it appears to run to the passenger side, despite the switch being on the driver's side next to the steering wheel. I dont want to pull down the roof liner, because it was re-done a short time before I bought the car and it is in good condition (a rare feature in this car!)

Many thanks

Rizz

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Bartman4800
300 SLR
Posts: 1937
Joined: Fri 10 Oct, 2008 12:10 am
Model you own: w111
Location: Perth WA

Re: Rear dome light wiring

Post by Bartman4800 » Tue 03 Jul, 2018 1:01 pm

It should be easy to measure a short between the wire and earth (car body) using a multimeter.

If it has shorted, use the existing wire to pull in a new one...


Bart
1963 220 Sb Sedan "Kermit" (Australian Assembly)
1960 220 Sb Sedan "Zum Schlachten" (Early German Assembly, with a torsion bar spring for the bonnet) - Stored in Country WA
1981 Subaru Brumby 1.8 with Weber and 5-speed box "little utie" - Sold to another enthusiast!
2006 Ford Focus "daily driver"
2002 VW Passat V6 30V Station Wagon (SOLD - This car into a money pit)
2011 Kia Sportage "Missus commuter Bus"
2002 Mitsubishi Rosa Bus (converting it to a motor home)

Rizz280s
C Class
Posts: 36
Joined: Wed 17 May, 2017 11:45 am
Model you own: w108
Region: Western Australia
Location: Perth

Re: Rear dome light wiring

Post by Rizz280s » Tue 03 Jul, 2018 8:41 pm

Wow, that's a great idea - simple and effective. Probably better than just patching up an old wire too.

Cheers Bart!

Rizz280s
C Class
Posts: 36
Joined: Wed 17 May, 2017 11:45 am
Model you own: w108
Region: Western Australia
Location: Perth

Re: Rear dome light wiring

Post by Rizz280s » Sun 15 Jul, 2018 2:21 pm

I finally learned how to use my multimeter and autoelectrics don't seem so daunting anymore. Woohoo

Turns out that there is additional wiring on the rear dome circuit: rear door jamb switches that turn on the dome light when the rear doors are opened, bypassing the rear dome switch. These were fed in to the rear dome switch and were causing the short (image, switch on the right).
The original rear dome wiring is fine thankfully.
The switches look like aftermarket Hella "door contact switches". Any idea if these were original in the 280S/8?
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User avatar
Bartman4800
300 SLR
Posts: 1937
Joined: Fri 10 Oct, 2008 12:10 am
Model you own: w111
Location: Perth WA

Re: Rear dome light wiring

Post by Bartman4800 » Mon 16 Jul, 2018 11:21 am

Hi,

The door switches in my finnie (predecessor of the W108) look very similar.

Hella is a German manufacturer and I would not be surprised it was on of MB's suppliers for this particular part

I thought only the front ceiling light (near the rear view mirror) comes on with opening the doors

By the way: the denominator /8 is used for the W115/W114 chassis. Yours is a W108

Bart
1963 220 Sb Sedan "Kermit" (Australian Assembly)
1960 220 Sb Sedan "Zum Schlachten" (Early German Assembly, with a torsion bar spring for the bonnet) - Stored in Country WA
1981 Subaru Brumby 1.8 with Weber and 5-speed box "little utie" - Sold to another enthusiast!
2006 Ford Focus "daily driver"
2002 VW Passat V6 30V Station Wagon (SOLD - This car into a money pit)
2011 Kia Sportage "Missus commuter Bus"
2002 Mitsubishi Rosa Bus (converting it to a motor home)

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