> 
>    Or is the grid really a bunch of resistive wires in parallel, such
>    that one (or more) of the lines would work, even if the others aren't
>    working?
> 
>    The wiring diagram suggest the defogger is one long resistive wire.
I think it is, but splits into a bunch of parallel ones on the window... 
Sounds like most of yours have scratches, except the one that's 
working. You can get conductive paint to patch any scratches you 
find.
 
> 
> ---------------------------------------------------------------------
> Tom Young               young@sherlock.SIMS.Berkeley.EDU
> Lafayette, CA  94549    '81 Vanagon
> ---------------------------------------------------------------------
> 
> 
Shawn & Janis Wright
'88 Westy (336k) '85 Jetta TD (361k)
VWnut@smus.bc.ca (swright@smus.bc.ca)
http://www.islandnet.com/~swright/vw.html