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Old 10-17-2017, 02:12 PM
Old Dog
Join Date: Sep 2015
Location: Klamath Falls, OR
Posts: 31
Mercedes W123 Headlights

(I converted my head lights to halogen a couple years back; they worked great; very bright and no problems)

Recently, my low beams stopped working; I've tried replacing the bulbs twice. When testing the fuses (I think they are #11 and #13) I have no power coming to the fuses. (High beam fuses get power, no problem there.)

So, I thought it must be the switch. I removed it and tested all the positions for current flow (by using the simple tool that has an alligator clip on one end and a metal probe on the other end.) ALL positions on the switch work fine!

Apparently, the problem is between the headlight switch and the fuse box. (If you know these cars, W123s, you know that there is a giant maze of wiring under the dash right in this area! There are also a couple of electrical component boxes there as well.

The color coding, at the switch, for the low beams is white wires with a red stripe. Yet, it appears that the wires coming into the fuses are yellow.

I am hoping that someone has had this problem before and knows how to fix it. My thinking is that there is something wrong inside of one of the component doxes.

Any ideas?

2005 C320 4-Matic
85 300TD wagon with the third seat; I am slowly restoring it.
99 E300 TD
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Old 10-20-2017, 08:40 PM
Registered User
Join Date: Dec 2005
Location: Carson City, NV
Posts: 3,788
From looking at the wiring diagram, it looks like the wires for the headlight (possibly white/yellow) make a stop at the dimmer switch before moving on to the fusebox. You might try checking that.
Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 362,xxx miles
08 Triumph Street Triple 30,xxx miles, lowered 10mm in front, Pirelli Angel GT tires, EBC HH brake pads, otherwise stock.
88 Jaguar XJS V12 92,xxx miles. I should be in the garage now.
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Old 10-21-2017, 11:43 AM
Old Dog
Join Date: Sep 2015
Location: Klamath Falls, OR
Posts: 31
Thanks, Skippy, I will check that!

I just added this car to my account and see the wiring diagram. It shows the brown ground wires, on both sides, coming right out of the headlight boxes and then attached to the engine compartment. I am going to take them off and clean them. That could be an issue also.

I will also check the dimmer switch.

Thanks again,

2005 C320 4-Matic
85 300TD wagon with the third seat; I am slowly restoring it.
99 E300 TD
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