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Registered
1987 560 SEC
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14 Posts
Discussion Starter #1 (Edited)
I picked up a W123 over the weekend an am trying to get it to pass state inspection.

For the most part everything is in order except the high beams.

When I engage them the low beams they dim and the FOG lights come on.

I am guessing either the headlight switch or high beam switch is faulty.

Looking for diagnostic tips to determine which it may be.

Thanks
 

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Registered
1987 560 SEC
Joined
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14 Posts
Discussion Starter #2
Found out a few other details.

Some diagrams I've found show a brown wire to ground off of post 31 on the headlight switch.

I have no such wire.

Also my headlight are the 6 pin Euro instead of the 4 pin US wiring

Would this make a difference in the headlight switch wiring?
 

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Registered
1987 560 SEC
Joined
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14 Posts
Discussion Starter #3
Removed the ground post and cleaned and replaced

cleaned the fuse connections

Replaced both switches

with no success.

The wiring must be butchered somewhere.

Gonna start in the lights and move towards the dash with a test light, multi meter and a fine toothed comb.

the next day....

problem solved

apparently at some point someone took apart the LS (driver in US) head light connector

The high beam and low beam were crossed.

One would think it does not matter but it resulted in the original symptoms.

So $150 in switches for naught.

Live and learn.
 
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