[W126 Coupe] SEC...antenna, rear fog lamp, front fog lamps, warning buzzer

[mavris2 at comcast.net]

Dick,

RE: Antenna-

Yes, I believe I ended up hooking it in to the two black wires coming off 
the original Becker radio.  But its been 5 years so my memory may be a bit 
fuzzy :(
Cructhfield.com where I bought the radio from told me how to wire it.  And I 
think that there were two black wires that I connected, or to one then to 
the  blue wire lead for the new radio/ pwr, antenna.  My radio controls with 
on/off the antenna as well as I can use the dash switch if I choose.

Jason


----- Original Message ----- 
From: "Dick Spellman" <spell.yy at verizon.net>
To: <mbcoupes at mbcoupes.com>
Sent: Monday, July 03, 2006 6:45 PM
Subject: [W126 Coupe] SEC...antenna, rear fog lamp, front fog lamps,warning 
buzzer


> Hello list types:
>
> Antenna:  The trigger voltage and current of 0.1A at 12vdc from the 
> aftermarket radio does not appear to be sufficient for triggering the 
> original Hirschman antenna using the dash mounted antenna switch.  When a 
> source battery is directly connected through the switch, the antenna 
> works.  I am going to wire a sensitive trigger relay with 7amp contact 
> rating into the circuit so the radio will trigger the relay and the relay 
> will pass full battery to the antenna trigger circuit so that it works 
> properly.  Anyone else encountered this in their conversions?
>
> Rear fog lamp: In looking at how the rear fog light on the euro sedan 
> driver's tail light is wired, I noted that it has an 8 pin connector with 
> all 8 pins wired on the electrical harness.  Comparing this with the 83 
> SEC and the 90 US sedan (that do not have the rear fog feature) you have 
> the 8 pin connector but only 6 pins on the wiring harness.  The bottom 2 
> pins are absent and the respective wire harness leads are missing.  So, I 
> assume from this that a single 'hot' wire must be run from the combination 
> dash light switch (terminal NS on my 83 switch), plus 2 pins added (1 the 
> NS contact on the combination switch and the other to ground in the fender 
> by the antenna top or the ground at the next socket over) and the extra 
> bulb socket and wire with bulb added.  Seems a bit much work to enable 
> this option.  Has anyone done it?  To clarify terminal NS on the 
> combination switch provides 12VDC only when the switch is in headlamp mode 
> (an 83 requirement) and pulled out two detentes.  I've not been able to 
> identify the open terminals on the combination headlamp switch that would 
> complete a circuit and illuminate the center dot on the headlamp switch 
> itself.
>
> Front fog lamps:  The 83 fog lamps only light when the main headlamps are 
> selected first.  In other words unlike later model MB's where the parking 
> lights are selected and then you can pull for the fog lamps absent the 
> headlamps, the 83 does not permit this.  So, I've identified the two fog 
> lamp bulb positive feeds in the combination switch and removed them from 
> the switch.  I am plumbing them into a 10 amp rated 12vdc relay and then 
> taking the trigger for this heavy duty relay from the dash rear cabin 
> courtesy lamp switch (rear lamp circuit now disconnected) that I never 
> use.  I've removed the wire from the combination switch (NSE (always hot 
> 12vdc) and shown as fog lamp power source only)so it will be as the 
> factory wired it with the only difference being that the source now feeds 
> the circuit through this new relay vs. the original combination switch.  I 
> may wire a small LED and piezo(under dash) into the headlamp switch bezel 
> to remind me to shut the fogs off when exiting the car using the door 
> switch circuit to complete the ground on the piezo.
>
> Warning buzzer: I hope to eliminate the ugly warning buzzer with a 
> two-tone selectable piezo like the euro has.  It sounds more like a 
> whistle (not at all irritating) and has two different tones.  One for door 
> open key in ignition and the other for the combination switch on in one 
> state or another.
>
> Hope everyone has a Happy 4th.  I've got a few days to tinker with the SEC 
> so, that's what I'll do in between gatherings and fireworks in Boston.
>
> Take care,
> Dick working on the finer details of an 83 380SEC that will soon be a 500
>
> The MB Coupes Website!
> W126 SEC Mailing List
> Postings remain property of MB Coupes, L.L.C.
>