Plastic Cover for Engine Wiring Harness - E30 318is & E30 This cover is a MUST if you are trying to keep your E30 M3 or 318is engine bay looking clean and fresh. If your wiring harness cover is broken, cracked, faded, or missing we highly suggest buying this brand new Genuine BMW wiring harness cover to get your engine bay looking super clean once again. e30 harness | eBay Find great deals on eBay for e30 harness. Shop with confidence. Skip to main content. eBay Logo: 1988-1991 BMW E30 Engine Wiring Harness LATE MODEL M20B25 325i 325is 325ic See more like this. New Genuine BMW Engine Diagnostics Harness Cover E21 E23 E24 E28 E30 12521286052. FAST & FREE SHIPPING - NEW GENUINE FACTORY DIRECT PART.