I have 2 RL70C displays that were on my boat when I took a lightning strike. I have them at home and am trying to connect a Garmin handheld GPS to them to see if they still will work. I have the GPS set up to send out NMEA183 data but can not get the display to see the GPS. I am trying to use the wires in the power cable as described in the manual. What wires should I connect to the GPS NMEA signal? Does the shield have to be connected to ground?
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