I appreciate the help! I’ll have to take a look at this when I get home and double check, but I’m pretty sure there is already a 2 pin aux power supply up there. If that’s what you mean by CAN connectorI just parted with my '17 YEC harness or I'd go look again. I want to say that was another CAN connector. Mine had a rubber boot on it, and it just laid on top of the valve cover since I used the CAN plug under the seat area instead.
I don't recall fiddling with any other 4 pin connectors up there, which reinforces my CAN plug suspicion.