W123 dome light with reading light?

[BenzTurbo]

I found this out at the PNP and would like to know if i can use it in my 1983 300cd. The wiring plugs in the same and fits perfect but it does not work at all. I have tried all the "modes" on the wheel and nothing I think it would be nice to have the added light.

[MBeige]

That's a direct swap to your '83. The '82 W123's have a smaller opening and will not accept the switch.



If it doesn't work, see if there are broken or loose contacts. Of course I'd check the bulbs first, the small map light is actually a 5W unit, and burns brighter/whiter than a standard 4W found in "city lights" of European headlamp assemblies.

IIRC the large festoon is 5W only, double check length and wattage because they're very similar to the license plate bulbs, so you do not mistakenly put in the wrong wattage bulb and burn the plastic.

[BenzTurbo]

Hmm, must be something wrong with this light. Ill check it out. Its good to know a working one will just plug in! I am on the hunt now Thanks for the help. I really like that auto dimming mirror! Do you have a link to the install?

[TnBob]

Tarnex or Brasso would sure make quick work of cleaning up those contacts too.

Might try a pair of jumper wires from your battery on the contacts to see if it actually works too. You probably have a bad switch.

[greazzer]

This is the dome light I have in my 1983 240D. The bulb is slightly longer than my big baggie of bulbs. I slightly bent the prong tab and its works fine. I havent tried turning the switch to see its functions. I was happy that it worked after replacing the bulb and it lights OK when you open the door and it stays on for a few seconds afterwards.

[winmutt]

I grab these at the yard when ever I see them, to help fund my addiction. They can be found in 123 and 126 and were an option.

[BenzTurbo]

so i need to check out the contacts on the rotary switch?

[BenzTurbo]

is it possible to take the board out? I cant figure out how to without de-soldering the power connectors.

[TnBob]

Yes Id sure be checking the contacts on your rotary switch.

Tarnex sure does a job on them. That an a rubbing alcohol wash afterwards works great.

[BenzTurbo]

Ok, i sprayed a tiny bit of brake parts cleaner (i know its very harsh) on the contacts to see if there was any hope and it works! I will now get some crc electronics cleaner that wont eat the plastic! Thank you all for the help

[MBeige]

Originally Posted by BenzTurbo

Hmm, must be something wrong with this light. Ill check it out. Its good to know a working one will just plug in! I am on the hunt now Thanks for the help. I really like that auto dimming mirror! Do you have a link to the install?

If that one wasn't too expensive, you can get another at the yard. New MB units are around $130 to $150.

Auto dimming mirror: no installation pics, but there is a narrative included. It also has Homelink (garage door opener) and compass built in.

Installed an auto-dimming mirror for W123

Got it from Rik Johnson: 2phast Motorsports

[charmalu]

Originally Posted by winmutt

I grab these at the yard when ever I see them, to help fund my addiction. They can be found in 123 and 126 and were an option.

Some of the W201 Chassis have them also.

Charlie