Not sure which harness you got but the newer harnesses they removed one of the harnesses leaving 3 harnesses, along with the power and ground wire and then the two wires you tap into the CAN wires with. If you have a 4th harness it is not needed.
What I have connected are two harnesses, brown and rainbow, the blue harness I am not using. I then have the power and ground wire connected and the two wires that tap into the two can wires.
I would shoot an email over to Burger for further assistance they are very quick to respond.
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2022 M4 Comp X
2021 M440ix - Sold
2015 M235 - Sold
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