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Installing Lowrance

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I just bought a used but almost new Lowrance 334i GPS and I'm a little confussed with the installation. I can do the transducer but I'm a little confused with all the other wires. I found the sonar power but I'm confused on the other cable's whether or not they need to be hooked up?

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The power plug cable should have three sets of wires.

power for sonar unit (pos-neg)

power for Internal GPS (pos-neg)


All three wires could be used depending on what you will be using. This is how it is on my 522i. I did not use the NMEA. Hope this helps.

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You definitely need hook up the main power and the GPS receiver power. It took me a week to figure that one out. I too bought a used unit and the owner's manual is not really clear. The NMEA needs to be powered if you are connecting this unit to another unit or another appliance that outputs NMEA code.

One other thing about the additional set of power wires is that they never power down. Your GPS receiver is never off if you have an external antenna. I am not sure about units with an internal antenna. This means they do put a small draw on your battery. If you let your boat sit for extended periods of time, I would suggest running all the power through a master switch.

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