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Old 05-03-2009, 04:44 PM
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Join Date: Jan 2005
Location: La Crescenta
Posts: 143
W124 Lowbeam Bulb Issues

Hi Guys,

I am having a problem with my Lowbeam on the drivers side. Basically it will turn on and turn off by itself! the bulb is brand new, so i have had to drive with the highbeams at night so i avoid getting a ticket. Any ideas on how to test this or fix it?


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Old 05-03-2009, 07:39 PM
compress ignite's Avatar
Drone aspiring to Serfdom
Join Date: Feb 2004
Location: 32(degrees) North by 81(degrees) West
Posts: 5,554
Short or Mis-Wire

Time to get the Wiring Diagram and DMM (or Analog MM) and get busy.
The grounding points behind each Headlight Assembly are notorious for
causing false diagnostics and other problems.
[Clean and Tight are the operable words]

Outside chance Ignition Switch is "Foolin with" you,But start with the basics first.

'Round Here, High beams will get you a ticket, faster than no lights at all!

'Regularly see the Intellectually Challenged operating "After Dark"
(or should that be politically correctly termed "Post Sunset" ?)with ONLY Parking Lights.
(They turn on the PLs,
['forget they've done so.
'Difficult to remember with the Whoofer Pumping 865 Db!]
and then think that because the Dash Lights are on...
that they also have Headlights on.)

Two nights ago,10:30 P.M. ,Pickup truck on a rural road ,driving with
Emergency Flashers ONLY.(He was gonna make sure NOBODY hit Him!)
'84 300SD sold

Last edited by compress ignite; 05-03-2009 at 07:51 PM.
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Old 05-03-2009, 08:39 PM
carnut's Avatar
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Join Date: Jul 2006
Location: Stockton California
Posts: 637
Each lamp has its own fuse. A corroded/loose fuse could cause this as well. I've used the copper element type to lessen the corrosion.
81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.
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Old 05-03-2009, 09:15 PM
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Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 14,958
Most likely your problem is a loose connection between the harness plug and the headlamp assembly. Make sure all the pins are clean and that the socket is getting a good solid grip, it should be pretty hard to remove. If it just slides right off easily thats your problem. Opening up the socket on the harness and slightly "closing" the female pin openings will cause it to get a better grip when installed....solving the light issue.
-diesel is not just a fuel, its a way of life-
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'01 E320 - 167k - dad's (OC-171,500)
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