I have a 1995 W124 220 coupe, when i purchased the car it has a 4 pin ECT, however on all wiring diagrams it shows a 2 pin ECT, I am wondering if someone installed a 4 pin ECT for some reason. My question is what should it have a 4 pin or 2 pin ECT and I cannot find any wiring diagrams to show where the 4 wires go to. Obviously one ground and one live go to ECM but what about the other two?