Hi,

My left low beam isn't working. I've changed the bulb, and the fuse.... no luck. Curiously there is voltage at the plug (12.5v) when the lights are turned on... equally as curious, there is a different voltage at the fude terminals (10.8v).

Any ideas? I'm stumped.

(ps.... you might notice I have a few new posts on here, sorry for the flood, I have quite a few gremlins... thanks for your help!)

Open up the fuse box, and tap the big long relay looking box then see if the low beam pops on.

I know on my 420SEL the one fog light turns off randomly and then if I tap that unit it will come back on.

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82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k

Wiggled it, poked it, shook it.... no luck.

If the relay or the switch was bad, I'm assuming that I wouldn't see 12.5v at the plug? would I?

The only guess I have is a dirty terminal in the plug, but I would also think that I could wiggle that to get the light to flicker.. but it doesn't.

It a pretty small hole in the terminal... anyone have any idea how to clean it?

Thanks again.....

Have you verified the bulb is good?

Might swap left to right and see if the problem moves.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles

You've got 12V to the bulb socket.... Have you checked the ground side? Bad grounds cause all kinds of unusual problems.

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My first Mercedes Benz. 4/6/07.

1984 190E (201 024) 2.3L four.

I wish my issue were that simple. I have a problem of a weak high and low beam. I have tried 3 bulbs and the results are the same.

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Current:
1985 300D aka Miss Margaret
1991 300SE aka Alarice
1995 SL320 aka Samantha
1997 K1500 Silverado
Past:
1999 E300 ex-wife got it and let her son ruin it
1984 190 2.3 ex-wife got it and let her son destroy a great car
1985 300D (CA version) aka Maybelline lost to deer at high speed.
1981 300D aka Madeline (went to salvage at near 400k) rusty, yet best car I ever drove
Wishlist:
McFarlan TV6 (only a few privately owned)
ReVere with Rochester engine
1917 Premier (only one left)

I originally bought a new bulb without even checking. It didn't work, so I swapped with the other side, still didn't work.

There are three 'holes' on the plug. C L an H. I get 12.5v between C and L if lows are selected and 12.5v between H and C when highs are selected. I assumed it meant C-ommon(ground) L-ow H-igh.

Still puzzled.

The combo switch can cause grief too.

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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