Help With Installing 4-Way Wiring On a 2014 BMW 328D XDrive Sport Wagon

Question:

I have a 2014 BMW 328d XDrive sport wagon and purchased a Tekonsha 119191 wiring kit for running the trailer lights. I am attempting to determine the wiring hookup for the car and am really getting confused. I cant figure out using my multimeter which wires are which. I removed the drivers side outer tail light, and noted that there are four wires going to the tail light via the connector. Here is what I have: Pin 1: Yellow/Black wire Pin 2: Black/White wire Pin 3: Brown wire Pin 5: Purple/Gray wire When I have the headlights on, it seems that pins 1 thru 3 have some voltage. Pin 2 seems to be the left turn signal. I cant determine which wire is the ground wire. Can you provide more guidance on which pin/wire color is which for connecting up the Tekonsha 119191? Thanks for your help on this. Regards

asked by: John N

Expert Reply:

While the only way you can verify exactly which wire is which on your specific 2014 BMW 328d XDrive is by contacting a dealer with the VIN or testing. We did install a similar 4-Way # 119250KIT on a 2018 which sounds like it has similar colored wires. I have linked the install video below which will hopefully help you with your installation as well.

I find often times using a multimeter can be difficult and a Test Light # PTW2993 is much simpler.

expert reply by: Bud M