[Smackdaddy53]

It looks like the blue and black are labeled. Do you not have some sort of instructions for wiring this system up? I found some detailed instructions online for a client of mine but I can’t find them at the moment.
You should look for a wiring diagram for your specific outboard as well, that would be very helpful.

 

[Smackdaddy53]

Best I could do brother

https://outboarddirect.com/wp-content/uploads/2020/12/99518-03180-03A-Rigging-Manual.pdf

 

[Smackdaddy53]

The black and grey nmea labeled wires were sufficient to power the network. Fyi

Did you figure out what the black and blue wires were? I saw several schematics showing the blue was for the kill switch but those in your photo were plugged from the factory.