[W126 Coupe] Relays

[Iain Gunn]

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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