Go to www.garmin.com . On the Support page for marine products, you will find a download for the installation manual for your chartplotter, which will contain a wiring diagram to show you which of the wires in the harness are the NEMA + and -. (depending on the model, there may NEMA 0183 and NEMA 2000 connections available, or a NEMA 0183 Output and NEMA 0183 input).
There seem to be a lot of variations in the wiring harness for various plotters. I believe the 130 on one of the boats only head NEMA + and NEMA -. The 162 and 168 had NEMA out, NEMA in, and NEMA ground. The new 541s I will be installing this weekend has a NEMA 2000 connection plus two NEMA 183 connections. It will take an AIS input on the second NEMA 183 connection, so I guess I will have another project to add to the list to connect the AIS output from the radio at the nav station to the input for the plotter at the helm. The installation information for the Raymarine and the Standard Horizon radios on my boat also have wiring diagrams that show which wiring connections to use for the GPS input. There were instructions for connecting the GPS as well. You might find the documentation that came with the radio, or try to download a copy from the ICOM website. Rick Brass Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Alan Dechovitz Sent: Tuesday, January 01, 2013 5:48 PM To: cnc-list@cnc-list.com Subject: Stus-List DSC Connections Has anyone wired an ICOM VHF to a Garmin GPS for DSC. I have the ICOM M502. It has a red and a black phono plug in the rear. The user manual says that one of these (doesn't designate which) is for the GPS connection. The Garmin has a five pin NMEA 0183 v2 plug in its rear. There is no standard interface cable. I'm figuring that two of the wires coming out of the back of the garmin constitute the NMEA talker. I plan to cut one of the phono plugs off the ICOM to expose the wires and use solderless connectors to attach the listener wires to the talker wires. Problem is - which wires coming out of the Garmin and which phono plug ton the ICOM to cut off?
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