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rear defrost fixed, but now another problem

It's that time of year again when a rear defroster comes in real handy
so I dug in today to fix mine.  I posted for help on this before and
created a bit of a stir over the location of the defrost button (mine is
in the climate control head unit)

What was happening, was that when I pressed the button the rear defrost
light would come on, I could hear a faint relay click, but the elements
did not heat up.  Checked the grid (visually and electrically) and all
is OK there.  

Here's what I found:

First of all, the relay is not marked on any of the labels in the car.
I found it by pressing the defrost button on and off while I felt each
relay in turn.  Second of all, upon opening it up, I found it was a
double relay with the contact arm having 2 switches.  Thirdly, I noticed
that the terminal for the wire going directly to the defrost grid was
blackened and melted in the relay holder.  I activated the relay with
the cover off and found that the contact arm was being blocked by
something.  I monkeyed with it for a bit and something went snap and the
arm now moves freely up and down. Activated it again and it works well
on the downstroke...but, it won't release.  I press the button .. stays
activated, turn off the key....stays activated.  I suspect this is why
the terminal melted. 

Does anyone know if this is a relay problem, or a result of current
coming from somewhere that it shouldn't?.  I can physically pull the
contacts apart and they do stay apart, until activated again.  There is
one very curious thing though.  A few seconds after physically pulling
the contacts apart, I hear  a series of three clicks ...click, click,
click (like 3 relay clicks)  from the engine compartment.  I did this
many, many times to be sure the two were related. I could not isolate
exactly where it comes from but it seems to be coming from the ABS
unit...?....?...?  Anybody have any ideas what this may be?  


Stephane Livolsi
180 Yorston St
Williams Lake, BC, V2G 3Z1
ph 250-392-2637
fax 250-392-2693

'86 5KTQ stock (if you don't know what it means, you aren't in the club)