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Old 03-17-2008, 12:29 AM
pawoSD's Avatar
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 14,861
Originally Posted by Samuel M. Ross View Post
CR from Texas / PawoSD,
IF I remember correctly on these vintage MBZs, the headlights are NOT fused... but I could be wrong and I canNOT find my Haynes just now!
Indeed they are fused. Each headlight (including the fogs) are on a different fuse.....thats why I think it might be possible to exceed the heat/draw of one wire to a light as they are only one to a fuse....
-diesel is not just a fuel, its a way of life-
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'01 E320 Wagon - 149k - mine (OC-154,000)
'05 C240 4matic Wagon - 153k - wifes (OC-154,500)
'01 E320 - 162k - Dad's (OC-163,500)
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Old 03-17-2008, 01:30 AM
Posts: n/a
Originally Posted by dbn1066 View Post
I was pulled over last year for my fogs. They're not illegal, but Not to be used as running lights. I was informed to only use them in the FOG
Um, duh?
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Old 01-05-2009, 12:09 AM
landstrasse36's Avatar
Car Connoisseur
Join Date: Jan 2009
Location: Minnesota, USA
Posts: 2
I have a w126, not w123, but...

I installed an 1156 LED bulb in my third brake light and it works fine. It does not interfere with cruise at all. Since the bulb points towards the interior at the reflector, it illuminates the entire fixture, and the bulb I purchased has several LEDs on the side to help with the illumination. I also am planning on retrofitting a rear fog, but I am not sure about how to go about doing it. Is it as simple as running another wire up to the switch?
1989 Mercedes-Benz 300SE
2004 Audi TT 3.2 S-line
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Old 01-05-2009, 12:51 AM
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Originally Posted by landstrasse36 View Post
It does not interfere with cruise at all.
There is no reason it, or any other light, could interfere with cruise.
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Old 01-05-2009, 07:18 AM
compu_85's Avatar
Waiting for his Model 3..
Join Date: May 2008
Location: Springfield VA
Posts: 5,166
Sure there is. The cruise computer check to see that you aren't using the brakes by trying to ground through the brake lamp bulbs. No ground = lights on. LEDs being diodes don't let current flow the opposite way through them.

1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
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Old 01-05-2009, 08:37 AM
Posts: n/a
Which isn't a problem since LEDs in housings with reflectors designed for incandescent bulbs not only don't look good, they are unsafe since LEDs emit a focused point of light. Nobody in their right mind would replace all their lights with LEDs.

Since landstrasse36 only put it in his third brake light, which is a generally useless light anyways, his remaining lightbulbs serve the cruise function normally. Even if all lights were replaced with LED, a single resistor to ground would suffice.
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Old 01-05-2009, 06:35 PM
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Join Date: Jan 2009
Location: Minnesota, USA
Posts: 2
Mine doesn't look like a stupid dot though like most of them do. The bulb doesn't point at the car behind me, it points towards the front of my car and reflects back. I like having the LED third light since it lights up faster than the rest.
1989 Mercedes-Benz 300SE
2004 Audi TT 3.2 S-line
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Old 01-05-2009, 07:00 PM
mild insomniac, maybe? :D
Join Date: Jul 2007
Posts: 954
I'm about to put an LED bulb in my high mount 3rd as well, that is until i can find a nice FULL LED 3rd brake light, hopefully on fleabay, or @ a pick n pull
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Brake light mod for 123's-3118404317_76c389e41c_o.jpg  
Matthew McIvor

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Old 03-17-2013, 02:55 AM
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Location: Metro Detroit, Michigan
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for new members
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