Hello Brickboarders, I am attempting to swap out the cloth seats of my 1990 740 turbo for the leather seats of an 87 740 turbo. On the passenger side My car (1990) has a three wire connector (blue=hot from switch, and two black ground wires that both enter one single pin) The leather seat harness has four wires a 1. red and black wire, 2. yellow and black wire 3. thin white and black wire 4. two black wires I assume are grounds. What is the best way to go about getting these two different types of seat heaters to function together? Has anyone out there done a swap over like this or is it a lost cause? Thanks for any help you can give. Jonny