[W126 Coupe] Water leak Update

[Dick Spellman]

Hi Rick,

You've got two fuses, #3 and #7.  I'd check fuse 3 where it's 30 amps 
and you say you get a lighted switch which indicates fuse 3 is okay.  If 
that does not solve the problem, check the defrost wiring connector at 
the rear window for the presence of 12vdc with a volt meter when the 
defog switch is lit to confirm that in fact the new relay is closing as 
it should.  If that checks out, then you know + power and the ground are 
good.  If it does not it's either a bad relay or a bad ground in the 
trunk.  I'd say the last thing to check is to run an ohm meter across 
the window defog connector absent the harness to the relay and see if 
you get a closed loop as you should on the heating element in the new 
rear glass windscreen.

The above presumes you have an 86-91 and I pulled the circuit diagram 
from the mb service cd to provide the above test sequence.

Regards,

Dick
a DIY'r for sure

WRick11499 at aol.com wrote:

> Fuse or relay  for the rear window

> I need to replace something  !!!  new rear window(not used)  relay 

> replaced , the switch does work,and the yellow light comes on but the 

> R/W defrosted still does not work    Rick

>

>

>

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