w108 foglight wiring - Mercedes-Benz Forum

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post #1 of 31 (permalink) Old 02-21-2015, 09:23 PM Thread Starter
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Date registered: Dec 2011
Vehicle: 1967 W108 250s
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w108 foglight wiring

I am adding a set of front fog lights to my w108 250s and am testing the waters of knowledge. I would like to wire them up like they were wired as a dealer option. My owners manual list the stock switch as having the ability and option to activate this accessory. I'm hoping members with knowledge can chime in on the correct wiring to the switch(what lead on the switch?) and what relay they used.
Thanks
Dave
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post #2 of 31 (permalink) Old 02-21-2015, 10:29 PM
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Wiring diagram

I can email you the wiring diagram from my 111-I'm sure it is very similar. PM me with your email. It's too big to attach.

Tony
280SE 3.5 Coupe
Stick shift
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post #3 of 31 (permalink) Old 02-22-2015, 07:20 AM
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Quote:
Originally Posted by 3.5 Tony View Post
I can email you the wiring diagram from my 111-I'm sure it is very similar. PM me with your email. It's too big to attach.
Hello Tony:

Would you mind emailing me the fog light wiring diagram as well please. I have a 72 280se 4.5 that I am also going to install front fog lights to.

I have purchased new headlights with triangle lights wired as well as a set of older Bosch fog lights. From my understanding if you pull the light switch then the fog lights will turn on.

Let me know and I will PM you my email.

Thanks,
Kal
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post #4 of 31 (permalink) Old 02-22-2015, 08:04 PM
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Blue, I'm doing exactly the same. There is a plug behind the headlights as part of the harness that looks like the female of a phono plug- I've seen the original wires for the stock foglights on eBay and it looks like a male phono jack. From what I've read in the archives, it should be easy to run the single wire from the fogs into that and have the stock switch actuate. However, I'm planning on adding relays for extra brightness and switch longevity
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post #5 of 31 (permalink) Old 02-22-2015, 08:05 PM Thread Starter
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Quote:
Originally Posted by 3.5 Tony View Post
I can email you the wiring diagram from my 111-I'm sure it is very similar. PM me with your email. It's too big to attach.
P M Sent

Thanks
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post #6 of 31 (permalink) Old 02-23-2015, 09:09 AM
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Originally Posted by Climbernyc View Post
Blue, I'm doing exactly the same. There is a plug behind the headlights as part of the harness that looks like the female of a phono plug- I've seen the original wires for the stock foglights on eBay and it looks like a male phono jack. From what I've read in the archives, it should be easy to run the single wire from the fogs into that and have the stock switch actuate. However, I'm planning on adding relays for extra brightness and switch longevity
Thanks for the info Climbernyc. My mechanic is going to do the foglight work, its a bit beyond my skill. I will pass this onto him.

He is also upgrading the alternator to a 90amp unit which he got from Amazon.
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post #7 of 31 (permalink) Old 02-23-2015, 05:22 PM
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That's great but remember the resistance of the old wIrving and switch can destroy the switch. Have him use the switch to activate a relay which turns on the fogs. It will still work the same way as far as the switch goes but will be much safer. What was the stock alternator for a 1972 280se 4.5?
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post #8 of 31 (permalink) Old 02-23-2015, 08:48 PM
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sent

Wiring diagram sent. I scanned it in Hi res from my owner's manual-it is very detailed.
Quote:
Originally Posted by helleifenbein View Post
I am adding a set of front fog lights to my w108 250s and am testing the waters of knowledge. I would like to wire them up like they were wired as a dealer option. My owners manual list the stock switch as having the ability and option to activate this accessory. I'm hoping members with knowledge can chime in on the correct wiring to the switch(what lead on the switch?) and what relay they used.
Thanks
Dave

Tony
280SE 3.5 Coupe
Stick shift
3.27 Axle
5.6 Iron block build in progress
3.5 Tony is offline  
post #9 of 31 (permalink) Old 02-23-2015, 08:51 PM
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Hey Kal,
Do you still need this? I need your email
Quote:
Originally Posted by bluenapster View Post
Hello Tony:

Would you mind emailing me the fog light wiring diagram as well please. I have a 72 280se 4.5 that I am also going to install front fog lights to.

I have purchased new headlights with triangle lights wired as well as a set of older Bosch fog lights. From my understanding if you pull the light switch then the fog lights will turn on.

Let me know and I will PM you my email.

Thanks,
Kal

Tony
280SE 3.5 Coupe
Stick shift
3.27 Axle
5.6 Iron block build in progress
3.5 Tony is offline  
post #10 of 31 (permalink) Old 02-23-2015, 09:53 PM Thread Starter
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Location: Oregon
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Garage
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Thankyou Tony
scanned image was received

As for existing wiring on the w108 250s for 1967 there is nothing that resembles a add on for such as Climbernyc mentions.

The only reference I have for my model is the owners manual that list the stock light switch as having the abillity to turn them on. Maybe other chasis numbers had this. It looks like I will be creating the harness from scratch. I will probably follow the head light harness and source an old bosch relay. My biggest goal is to install something that looks like it belongs to the car.
Always welcome to hear more info
Thanks
Dave
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