BMW 740iL seats retrofit in my 1973 BMW: wiring - blogspot Oct 08, 2010wiring "pigtail" for each seat's wiring connector from the donor car. These seats use a very complicated AMP connector so it's important that you have it since it's nearly impossible to make your own. On the plus side, it's a very nice connector. two of BMW part 61318352259, "seat heating switch". This would certainly be a good thing to buy bmw seat wiring | eBay Find great deals on eBay for bmw seat wiring. Shop with confidence. Skip to main content. eBay Logo: FRONT SEAT WIRE WIRING HARNESS CONNECTOR PIGTAIL SET BMW E34. Pre-Owned. $19. Buy It Now +$7 shipping. Free Returns. BMW E46 Power Seat Wiring Harness Right 8226434 OEM 99-03 323 325 328 330 M3 See more like this.