The electric grid on the rear window takes a
lot of amperage to run. That's why it's on a timer. It's fairly common to see the fuses, and the "receptacle" look like they've been hot. One thing to check is what brand/type of fuses you are using. There are some out there that are NOT blowing at the proper time, which results in overheated wiring/circuits, at the least, and melted cars at the worse...
If you're having a problem with
good quality fuses blowing, then there is either a problem with the grid on the glass, or in the wiring somewhere, that is pulling even more amps than normal.
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Joel Adams
C3VR Lifetime Member #56
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"