8M4507538 Here are the controls that I have.
Here is the set up I just tried:
20250501_203637.jpg
I took the yellow terminating resistor from under the cowling and put in on the box. When I did that both CAN's stayed off. When I put the yellow terminating resistor back on the engine side under the cowling CAN H turns on and off really fast and CAN P remains off.

the part that confuses me as well is the manual doesn't mention a terminating resistor, only about the NMEA 120‑ohm termination resistor.
It also says this:
Connect the CAN 10‑pin harness connector to the helm harness SmartCraft 10‑pin connection using a male‑male
adapter harness.

Which I would assume would be this which I tried and gave me the same issue: