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first thing: always check your fuses.. look into your owners manual. :-)
I think I've had 18 bmw's in 6 years.
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.
latest addition as of 2013-Gold 87-325is auto! it's a keeper!
KEEPER 88 5sp Vert 2016
I assumed that the rear defrost wires in the hardtop glass shared a circuit with the rear defrost blower (which was working) as they are actuated by the same switch. However I guess it's possible they could share a relay but be on unique fuses.
Anyone wise as to how the hardtop wiring works? which circuit is on which pin? where the ground is made?
Although I hope it is a simple as fuses, I'm rarely that lucky; I'm willing to bet I'll be chasing a break in the circuit with a multi-tester.