Stripped the interior and found that right behind the fuse box is completely rusted out... At first I got annoyed about having to pull all the wires but then I thought there
BMW E30 Fuse Box Circuit Board Panel Red 004 61131372776 – Premier Bavarian
84-91 BMW E30 3-Series Under Hood Electrical Fuse Box with Wiring OEM USED LM89 | eBay