74 450sl headlight/fog light problems.. - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 11-07-2005, 11:52 AM Thread Starter
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74 450sl headlight/fog light problems..

My front left headlight won't work when I turn on my lights (right side works fine), but when I turn on my highbeams it works. Also, my fog lamps don't work either and I've checked all fuses. Is it an electrical mess or just the light switch?


thanks
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post #2 of 7 (permalink) Old 11-07-2005, 01:11 PM
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RE: 74 450sl headlight/fog light problems..

First question: Do you have Euro lights, or round, US lights?

Second: Have you checked the bulbs on the fog lights?

Third: Have you verified voltage to the light sockets on the fog lights?

If you have Euro lights, perhaps the low beam is shot on the left light. The fog lights could be the bulbs, the switch, or the ground on the fog lamp circuits... among other things. When you said you checked the fuses, did you put a meter across the fuse, or just a visual check? The fuses can be bad, or corroded, and still look good.

Good luck!


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post #3 of 7 (permalink) Old 11-07-2005, 01:28 PM Thread Starter
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RE: 74 450sl headlight/fog light problems..

Quote:
Ears - 11/7/2005 12:11 PM

First question: Do you have Euro lights, or round, US lights?

Second: Have you checked the bulbs on the fog lights?

Third: Have you verified voltage to the light sockets on the fog lights?

If you have Euro lights, perhaps the low beam is shot on the left light. The fog lights could be the bulbs, the switch, or the ground on the fog lamp circuits... among other things. When you said you checked the fuses, did you put a meter across the fuse, or just a visual check? The fuses can be bad, or corroded, and still look good.



Good luck!
Its a 4 lamp US version and yes I've checked all voltage to light sockets, all fuses are in good shape and voltage is fine. Does the switch terminals for each lamp?


P.S. Your logo makes me have to scroll the screen =p
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post #4 of 7 (permalink) Old 11-07-2005, 03:31 PM
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RE: 74 450sl headlight/fog light problems..

Quote:
Redux - 11/7/2005 2:28 PM


Its a 4 lamp US version and yes I've checked all voltage to light sockets, all fuses are in good shape and voltage is fine. Does the switch terminals for each lamp?


P.S. Your logo makes me have to scroll the screen =p
Do I understand correctly... You have voltage in the light sockets with the switch on? If this is the case, either the ground for that light circuit, or the bulb is bad. Check for continuity thru the bulb and check continuity in the socket ground to a known, good ground.

Sorry about the sig... It is sized for 1024x768 and above screen resolution. You are the first to report any probs...

RM Smith www.rmsmithco.com

Where is it again that we are going... And why are we in a handbasket?
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post #5 of 7 (permalink) Old 11-07-2005, 03:56 PM Thread Starter
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RE: 74 450sl headlight/fog light problems..

Quote:
Ears - 11/7/2005 2:31 PM

Quote:
Do I understand correctly... You have voltage in the light sockets with the switch on? If this is the case, either the ground for that light circuit, or the bulb is bad. Check for continuity thru the bulb and check continuity in the socket ground to a known, good ground.

Sorry about the sig... It is sized for 1024x768 and above screen resolution. You are the first to report any probs...
No, there is no power to the socket at the tail end of the line (left side lowbeam) at regular lowbeam use.

Ground is good because highbeam works and lowbeam comes on when highbeam is on.



Not complaining about your sig... =oo=


[:D]
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post #6 of 7 (permalink) Old 11-07-2005, 04:08 PM
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RE: 74 450sl headlight/fog light problems..

Your headlight switch might be suspect.

Felicita e un bicchiere di vino con un panino.
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post #7 of 7 (permalink) Old 11-07-2005, 07:28 PM
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RE: 74 450sl headlight/fog light problems..

Quote:
Redux - 11/7/2005 4:56 PM


No, there is no power to the socket at the tail end of the line (left side lowbeam) at regular lowbeam use.

Ground is good because highbeam works and lowbeam comes on when highbeam is on.



Not complaining about your sig... =oo=


[:D]
My mistake on the voltage... I think you and Ike have it pinned. I have never disassembled one, so I do not know if the contacts are accessible. Ike, Do you have any idea?

Good luck on your quest! I had a few wiring glitches with my 1988 560 which were cleared up by fuse replacement, and cleaning of ground contacts. Every once in a while, I still have a front, left parking lamp which needs a slight "tap" to get it glowing...

RM Smith www.rmsmithco.com

Where is it again that we are going... And why are we in a handbasket?
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