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I just bought a new Icom m412 radio and a shakespere 5225xt antenna. My problem is,I'm not getting the reading on the radio when I have one on my Humminbird 788ci. I called Humminbird checked to make sure it was compatible to the radio, it was so I ordered the linking cable. Parts arrived today, no wiring inst. Called again and was told what the 4 wires were,1 +,1 nmea out,1 grnd & 1nmea in. They said do not hook-up the+? Set the 788 to nmea on, no time, no location on the radio, any suggestions? Rudey

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Did you hook the nmea out on the Humminbird to the nmea in on the radio and the ground. You only need to hook up 2 wires to get it to work.

If you hook nmea in to nmea in it wont work you have to hook out to in then in to out.

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I took a look at the m412 manual and it looks like the nmea wires may have an inner and outer conductor. The inner core is the + and the outer wire you twist together and connect to the ground lead from the Humminbird if this is the case.

It's hard to know for sure since I haven't installed an icom in a few years.

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