Hi, I have an RS 4050 black box, it is for my raydome, now where do I plug the wire/plug into eg nmea port 1 or 2, 2nd question when I open up the black box I have 2 wires yellow and grey but no red or black, can I use these wires for red and black?

SOURCE: I bought a C80 Raymarine

I would send your seatalk (Yellow and black) from your c80 to a junction box, send your rs125 to the junction box and another pig tail seatalk lead to the J-box coming from the autopilot. Now...on the raystar 125 connect the green wire to red, and the brown to black. Now connect the reds together, the shields and blacks together and finally the yellow's. The autohelm should power up the seatalk bus enough for your gps to work. the c80 offers power from seatlk but don't connect it's red wire.



Autohelm ---------------[ ]----------------GPS
|
C80---------------------------

Many times the shield is the silver wire we call it that since it has no other coating except its occasionally heat shrinked on the end.

RS125 -------Green------------------------0-------------RED------------ + power
--------RED------/

--------Yellow-----------------------0-------------Yellow---------- Data
--------Black------------------------0-------------Shield----------- -Power
--------Brown---/

SOURCE: I have a Philips GPS Dantronik Navigater MK9 an

I connected my ICom using the NMEA in. I had the leads reversed first time, moved them around and worked. This was a connection from Furono to iCom but should be much the same