[W126 Coupe] Headlight installation help

[Dick Spellman]

Hi Jas,

I did not keep notes on this modification so I cannot provide the 
specific terminals I worked with on the 83 ignition switch.  But, here 
is pretty much what I did.  I disconnected the battery, then removed the 
IC, knee bolster and headlamp switch and its harness.  I peeled back the 
rubber boot that covers the screw terminals on the back of the switch 
(this is only present on the early MB's).  I had tested each terminal 
(live & careful with battery connected) for voltage presence with 
ignition on and for the path to the fogs.  Then with batt disconnected, 
I removed this one wire lead from the headlamp switch that feeds power 
to the positive side of the fogs lamps and wired it to a single pole, 
double throw (SPDT) relay normally open (N.O.) terminal.  The relay was 
rated 12VDC, 12amps - I pulled the related link for you below.  Not sure 
if I used the 912 or 912B.  Both will work, just can't remember which 
one I used to handle the MB wiring gauge.  I kind of keep lots of Elk 
gear around for projects I do for work and so on.  I then took the 
trigger side of the relay and routed it through the rear courtesy switch 
(circuit to rear courtesy lamp isolated and discarded safely behind the 
center console.  I then wired a 12VDC (ignition ON) positive source off 
of the ignition switch to the common side of the relay.  Now when the 
ignition is on and the courtesy lamp switch is on the fogs are on.  The 
last item I added was a 12vdc indicator lamp set into a spare idiot 
light holder in the IC and powered off of the fog circuit on the relay, 
so that when the fogs are on you know they are on.  I  dampened this 
indicator light ( a spare I pulled from another IC) as it was pretty 
bright at night.

Hope this helps, if I come across the terminal #'s or letters on that 
headlamp switch I'll let you know.

Regards,

Dick
<http://www.elkproducts.com/relays_timers.htm>

stefansj at canisius.edu wrote:

> Hey Everyone! I wanted to thank everyone that gave there advice as to how to 

> connect the eurolights, with all your instructions it was very easy. Thanks for all 

> your ideas Dick they where a huge help! I was interested in running the flood 

> lights the way you did as well, how did you do the wiring from the switch?. 

> Thanks again, Jas

>

> ---- Original message ----

>   

>> Date: Thu, 20 Mar 2008 09:00:17 -0400

>> From: Dick Spellman <spell.yy at verizon.net>  

>> Subject: Re: [W126 Coupe] Headlight installation help  

>> To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>

>>

>> Jas,

>>

>> As I recall you have an 83 380 that was originally a euro with some 

>> conversion done for U.S.  A couple of things to check.

>>

>> Do you have the original dash set-up with elevation control?

>> Did the fogs work on the previous US set-up?

>> Are you pulling the dash switch out to the first click to light the fogs?

>> Can you place a dc volt meter on the two-prong receptacle where you have 

>> plugged in the fog lead on each side (l/r) for the new euro headlight 

>> assemblies to see if i they're getting 12vdc?

>> If this is where there is no voltage, then I'd be looking at the pin out 

>> voltages from the 6-pin connector and confirm correct placement of pins 

>> per Steve Nervig's wiring diagrams.

>>

>> Glad to hear you have the euro set-up now.  Also, have you enabled and 

>> lamped the citi-lights?  Did you test that the vac system is fully 

>> hooked up and working?

>>

>> By the way on the early model US SEC the fogs will not illuminate 

>> without headlights on and switch pulled to first click.  There is no 

>> easy way to enable this on the headlamp switch assembly, I have tried.  

>> As a work-around, you can enable the fogs using a separate switch (I 

>> used the rear cabin courtesy switch, and I added an indicator bulb to an 

>> open instrument cluster socket) to allow them to be lit with no 

>> headlamps or side markers in use.  I pretty much leave them on all the 

>> time whenever ignition is switched on.  This is more in keeping with the 

>> later year model SEC's.

>>

>> Regards,

>> Dick

>>

>> stefansj at canisius.edu wrote:

>>     

>>> Hey everyone, I installed my euro headlights today and it was surprisingly 

>>>       

> very 

>   

>>> easy. My car is a euro model so everything was there I just had to take the 

>>> american lights out. When I did this I found that the 6 prong plug was there 

>>> along with the purple vacuum tubes. The headlights turned on no problem 

>>>       

> but 

>   

>>> the lower fog lights did not work. I plugged them into the headlights 

>>>       

> correctly 

>   

>>> and check the connection with no results. If anyone has any ideas I'd really 

>>> appreciate it! thanks, Jas

>>>       

>> The MB Coupes Website!

>> W126 SEC Mailing List

>> Postings remain property of MB Coupes, L.L.C.

>>     

> The MB Coupes Website!

> W126 SEC Mailing List

> Postings remain property of MB Coupes, L.L.C.

>

>   


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