Posted this a while back in the Defender forum by mistke:-
One side of my factory fitted heated windscreen on my 1997 Discovery suddenly stopped working last week. I think it was after I'd recharged the battery (I removed it from the car to charge). I'm not a great electrician, but am I right in assuming that only one fuse drives the unit and that therefore the problem is likely to be in the wiring to that side of the screen?
It was a factory fitted unit, but there's no indication which fuse (or fuses) are protecting it - I think the wiring runs to the fuse box under the bonnet, but all fuses look OK there (and also in the dashboard fuse box).
Thanks a lot for any guidance as to where the problem might be.
Jim Strong