[Early_S_Man]

bento,

There are two areas to investigate ... back in the engine compartment on the fuse/relay/ignition coil 'console' or panel on the left fender inner panel.

1. The #3 fuse, which is rated at 25 Amps.

2. The large, rectangular two-stage relay, p.n. 911.615.115.00! The contact numbering is:

86a 31 86
87a 87 30

With ignition on, you should have +12 Volts at pin 30 of the relay, and with the defog switch operated all the way out, +12 Volts should also be present at contacts/terminals 87 and 87a, as well as the two positive leads of the window wiring ... both of which are Red/Black wires.

As always ... all of the brown ground strap wiring should be checked for loose or corroded connections!

Broken traces of the heating grid can be repaired with conductive silver paint, which is available at most electronic supply stores.

Good luck!