While in the process of getting all the electrical bugs worked out I got my headlights working but the switch for the hi/low beam doesn't seem to do anything. The hi beam stays on no matter what position it's in. So I was wondering if there was a relay or something else that could be causing this or do I need a replacement switch.

Is this a Euro or US spec car? Their wiring differs. It would be a good idea to spend some quality time with a wiring diagram specific to your vehicle and make sure the wires are going where they are supposed to.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Yea it's euro and yes the wires are in the correct location. When I use the lever to switch to low beam the indicator light blinks but then stays on. Just wondering if it's common for these switches are a common failure. Also I thought I'd throw this in, that only my left headlight wiper works. It gets power and when I use the washer button the other pin gets power. I'm assuming it's bad but again I'm just wondering if there's anything I should look for.

See if this diy tech article is useful in troubleshooting the light switch issue - if there is something else that you need answered, feel free to post a Comment just below the article and someone will get back to you with more detailed info. Best of luck!

Mercedes-Benz W123 Headlight Switch Replacement | W123 (1977-1985) | Pelican Parts DIY Maintenance Article


-Dmitry