I am trying to install my new Garmin GPSMAP 840xs and am not sure how to wire it to my simrad AP14 autopilot and my IC-M502 radio. The new GPS has just 8 wires coming from the power/NMEA cable and the Garmin 2006C plotter I am replacing has 11 wires coming off of the unit and another 9 wires coming off the GPS receiver/antenna. 5 of the wires were connected between the receiver/antenna and the plotter, the red wire from the receiver/antenna and the plotter go to power, the black wires go to the negative bus bar, and then there is the grey wire from the receiver/antenna that goes to my radio and also to the Data port on the autopilot. the rest of the wires from the receiver/antenna and the plotter are not connected to anything.
So the only wire on the old GPS that is connected to the autopilot is the gray wire coming from the receiver/antenna. I have a wire from the radio that is connected to the gray wire coming from the GPS 17 GPS receiver/antenna, which is then connected to the Data port on the autopilot. Would I just connect the radio wire to the gray wire on the new GPS and then also to the Data port on the autopilot? The function of the gray wire on the new GPS is NMEA 0183 internal port 2 tx (out). It also looks like the metal sheathing from that radio wire is connected to a wire that goes to the comm port on the autopilot, would I just leave that the way it is?
not sure this makes any sense. I guess the question is how do I determine what wires from the GPSMAP 840xs need to be connected to the autopilot, and how do I connect my radio to the GPS and the autopilot
I know red is power and black is ground and that's about it. The wires that I do not know what to do with are Blue: NMEA 0183 internal port 1 tx (out); Brown: NMEA 0183 internal port 1 rx (in); Gray: NMEA 0183 internal port 2 tx (out); Violet: NMEA 0183 internal port 2 rx (in); Orange: Accessory on
I also currently have my Furuno 1712 radar connected to the autopilot but was told by Garmin that it will not work with this GPS/plotter; it has the NMEA input so any chance they were wrong? the owner's manual does say that you can connect the plotter to a GARMIN radar.
Thanks for any help,