[W126 Coupe] Relays

[Mister McGoo]

Hein;

Is it the power window relay that heats up?  Is it the little aluminum box 
001 542 02 19 marked "SR9850"  in socket "F" in your fuse box?

They are very common.  You should have one on either side of it in your fuse 
box.  Find a wreck, any 380, 500 SE, SEL etc.  Any of them should have 4 or 
5 of them in the fuse box.  Replace the heating one and try it out.  I'm not 
convinced that this is your problem, but hopefully it is that simple.

I have a couple sitting here on my desk.

And your power windows are not defective.  The Europeans train their 
children NOT TO PLAY WITH THE DAMN POWER WINDOWS when they are left alone in 
the car.

The windows DO work without the ignition key.

-Bellamy


>From: "Iain Gunn" <igunn at bmts.com>
>Reply-To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
>To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>
>Subject: Re: [W126 Coupe] Relays Date: Wed, 14 Sep 2005 20:56:48 -0400
>
>A relay is used to control heat. If you look at a relay, starter relay is a 
>good example. you will see usually 4 connection. 2 of those connections are 
>for the switch, 1 for the ground, (earth for the British commonwealth) 1 
>for the switch, these usually have a small core wire, such as 18-20 gage, 
>that can only take low amps or they heat up and burn out. The other 2 are 
>the high amp connections that have heavier wires, all the way up to 5 gage 
>for a starter, (BTW the lower the number, the heavier the wire). 1 for the 
>voltage in and the other for the voltage out. To close the circuit.These 
>are to provide the current for whatever is being used. In a relay the 
>smaller wires operate a coil, that when energized pulls a set of contacts 
>together that closes the circuit on the high amp side.  If relays weren't 
>used then all the wire in our cars would have to be heavy gage and massive 
>switches to operate anything. I have used Bosch 25-30 amp relays for years, 
>and it is the only relay that  will use, I've tried others and they are 
>juke and will not stand up to dirty, wet, salty environments with high heat 
>and freezing climates. Bosch uses a neat circuit that reduces the arc when 
>the relay is switched, is one reason they are so good.
>Go here for more information, scroll down until you see the relay  
>http://www.bcae1.com/relays.htm
>
>Hein, replace the relay, its points are stuck, go to a auto jobber, if you 
>have a problem let me know.
>
>  ----- Original Message -----
>   From: Hein
>   To: Mercedes Coupes Mailing Lists
>   Sent: Wednesday, September 14, 2005 6:19 PM
>   Subject: [W126 Coupe] Relays
>
>
>   Hi all,
>   Tell me something about relays, please.
>
>   1)What does it mean if one heats up when left plugged in.....
>      a)When I unplug it, the windows and sunroof dies.
>      b)If I leave it in the battery dies if the car is not driven for a 
>week.
>
>   2)How do you trouble shoot a faulty relay and FIX it?
>      I can't find one of those 1"X1" relays anywhere for sale.
>
>   3)I presume it is a circuit that is stuck open ...or shut inside the 
>relay, depending on your point of view.
>   or......a short circuit in the wiring to the windows or sunroof 
>somewhere that keeps power on and heats the relay, which doesn't make sense 
>as something would burn up eventually.....like my nice SEC
>
>   4)I look pretty stupid going to the Mall and having to open the hood to 
>take the relay out and then to return to replace the relay so that I can 
>open a window.
>   People look at me and I just say: "don't want anyone to steal my nice 
>SEC, so I take the on-star starter ignition control booster module with 
>me.....I can then turn the car off with my celphone if someone dares to 
>steal it"
>
>   Gets everyone going , snicker snicker
>
>   Hein PS Why did the administrator sensor my post of this morning about 
>the gangster mobile?? No, No uncle Satish
>
>
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>
>
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