Brake and Dash lights

1971-1989: 280SL, 280SLC, 300SL, 350SL, 350SLC, 380SL, 380SLC, 420SL, 450SL, 450SLC, 450SLC 5.0, 500SL, 500SLC, 560SL
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Willunga
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Joined: Sat 01 Nov, 2014 10:15 pm
Model you own: w107

Brake and Dash lights

Post by Willunga » Thu 13 Nov, 2014 2:34 pm

I did a search but couldn't find anything. The passenger side rear brake light is causing the fuse to blow. When no bulb is in the passenger side brake light, all is fine and the driver side light works. When the passenger side bulb is installed and the pedal depressed :crybaby: , the fuse blows. Any advice before I start. I'll clean the earth first and see if that works but any other hints? The dash lights won't come on. Shall I just keep twiddling until they do? Fuses are all ok in that area. Cheers all

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Greg in Oz
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Re: Brake and Dash lights

Post by Greg in Oz » Thu 13 Nov, 2014 6:37 pm

If the fuse blows only when the brake light bulb is installed, then the bulb is at fault. I have seen bulbs that, over a long period of time, have the lump of solder that forms the centre contact flatten or "creep" such that the centre contact in the lamp socket shorts out against the earthed base of the bulb. A replacement bulb should fix it. I experienced this very same problem in one of my SLCs.

As for the instrument lighting, it will likely be the well-known rheostat problem. The rheostat that allows the instrument lighting to be dimmed suffers from tarnished contacts and the lights go out. Sometimes repeatedly twiddling the rheostat knob will get it working. Otherwise the instrument cluster needs to come out to allow contact cleaner to be applied to the rheostat or the rheostat to be replaced. Some choose to electrically bypass the rheostat however I'm not in favour of that as I prefer the lighting dimmed (and also like things to work as intended).
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Tony From West Oz
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Re: Brake and Dash lights

Post by Tony From West Oz » Thu 13 Nov, 2014 10:50 pm

It is possible that the brake lamp socket has a short circuit when a bulb is inserted.

I hope this helps,
Tony
Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

'83 W123 300D 325000km (Wife's car Josephine - sold).
'84 W123 300D replaced good OM617 912 with OM617 952 and enjoyed having good acceleration for the first time since first driving a 300D in 2002 - became engine and trans donor for 300CD Turbodiesel conversion. Now parted out.
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Willunga
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Posts: 29
Joined: Sat 01 Nov, 2014 10:15 pm
Model you own: w107

Re: Brake and Dash lights

Post by Willunga » Fri 14 Nov, 2014 1:11 pm

Cheers guys. I'll have a good look on the weekend and let you know what resolves it-I hope.

Willunga
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Posts: 29
Joined: Sat 01 Nov, 2014 10:15 pm
Model you own: w107

Re: Brake and Dash lights

Post by Willunga » Sun 16 Nov, 2014 1:19 pm

Brake all sorted. As said, just a bit of corrosion on the supporting spring. No to tackle the dash! :think:

Willunga
C Class
Posts: 29
Joined: Sat 01 Nov, 2014 10:15 pm
Model you own: w107

Re: Brake and Dash lights

Post by Willunga » Sun 16 Nov, 2014 9:54 pm

Dash lights sorted. Just a little bypass surgery involved with the switch. No onto the headlights. I can't seem to find the adjustment screws. Where are they?

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Chai
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Re: Brake and Dash lights

Post by Chai » Thu 20 Nov, 2014 10:24 pm

There are 2 headlight adjustment screws (on the 107) and are on the front face.
One screw moves the silvered lamp reflector up and down; the other side to side.

The other screws (4, I think) hold the lamp assembly to the chassis/body.
You can remove the lamp from the car, then remove the front glass if you want to remove accumulated dust from the silvered reflector - making it brighter, assuming
the silvered finish is in good condition.

The lamp removal requires you to swing the lamp face downwards.

Hope these help.
Chai
1974 450SLC

Willunga
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Model you own: w107

Re: Brake and Dash lights

Post by Willunga » Fri 21 Nov, 2014 10:19 am

Thanks for that. Tried the adjustment screws but no movement. I'd say something has been stripped-not in a nice way :dance: . I've charged up the camera so will put up some photos. About to start the standard rust repairs. Will do a bit of a blog of these. I'll start in the boot well. Will give me something to do on the weekend. Lawn won't be mown again! I'll be in trouble soon.

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