What do the four wires hook up to? The red is power, the black is ground, where do the other two go to? Thanks for helping.
garmin fishfinder wire question
Muskie Nut is right. Those are data lines. More precisely, NMEA 0183 transmission lines. The most common use for those on a small boat is to make a connection between the sonar unit and a VHF radio. Then the two can exchange information like latitude and longitude in case of an emergency. With a radio that has the correct abilities it can send your exact coordinates to the Coast Guard if things go bad.
Its a Garmin 53dv and the wires are brown and blue. The transducer wire is separate and runs from the transducer to the screen. This wire runs from the screen to the power supply and has four wires in it. I know two the red and black are for power and ground.