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Old 08-24-2012, 05:55 PM
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Join Date: Aug 2012
Posts: 10
W115 Cluster

Hey all,

I've been a lurker quite some time since buying my 240D and since have decided to register.

My cluster lights haven't been working even since I've purchased that car and finally decided to try and figure out why. Of course it was the rheostat switch. The spring in it was pretty much destroy and everything was corroded bad. I decided to bypass the switch and just link the two connectors.

My lights work now, however, I've lost the ground to the fiber optic light. Can't find it anywhere and I'm almost 100 percent certain that I pulled it off while I was pulling out the fiber connectors.

Can anybody help me locate this dang ground?! One of my fiber optics is pretty destroyed but I'd like to have the other side of my speedo light up as well as the other fiber optic connector and have the piece of mind that my cluster is grounded properly.


BTW, that speedo cable is a major PIA to reconnect.
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Old 08-24-2012, 06:14 PM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 33,032
I'm guessing you are short of slack on the speedo cable. Pull it up to get some extra to work with and you may find it a lot better.
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. It still needs upholstery redone...I also have a 427 Cobra replica with an aluminum chassis.
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Old 08-24-2012, 08:53 PM
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Join Date: Aug 2012
Posts: 10
Yeah, I tried pulling on it as much as I could..not much came up.

Still in need of that ground, have no gas gauge either...
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Old 08-24-2012, 09:29 PM
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Join Date: Aug 2012
Posts: 10
This isn't my cluster, although it is very similar (this one is from a 300d, same year) but what I need to know is what connects to that light bulb directly above his thumb, well more towards the 2 o'clock mark. I feel as if I disconnected something from there?

Thanks for the help!

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Old 08-25-2012, 07:21 PM
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Join Date: Aug 2012
Posts: 10
Bump anybody?!
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Old 08-25-2012, 09:20 PM
79Mercy's Avatar
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Join Date: Mar 2008
Location: Florida
Posts: 4,128
nothing connects to that bulb. im trying to remember its been a while since i had my W115. But im pretty sure that picture is complete.
1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles
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Old 08-27-2012, 10:30 PM
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Join Date: Aug 2012
Posts: 10
You're correct. I figured it out, the bulb socket itself grounds to the cluster where it plugs in. Everything is tip top now other than my gas gauge is a little off I believe.
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