Question about Garmin FISHFINDER 300C NIC ()

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I recently charged my battery and since hooking it back up to my fishfinder it constantly says supply voltage too high transducer turning off. ive tested the battery and its perfectly fine.

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Maximum voltage for that unit is 33V. Test the voltage with a multimeter at the fuse block or as close to the unit as you can. If you are reading less than 33 volts than your voltage input is fine and you need to contact garmin for a repair or replacement if your unit is still under warranty.

Also check your connections at the battery; make sure everything is clean and that you do not have any + and - wires switched.

Posted on May 23, 2011

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Posted on Jan 02, 2017

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False fish readings are commonly caused by electrical interference such as alternator noise, and by air bubbles flowing across transducer.

For starters make sure your fishfinder is on an independent circuit and not on one powered by your ignition switch. In other words, you should be able to turn your fishfinder on, even though the engine is turned off. Ideally the fishfinder should be wired directly to the battery with an in line fuse.

Try running the boat at a speed slightly higher than trolling speed, then kill the engine, as the boat slows down to trolling speed do you still see false echos? If yes then the problem probably lies with how the transducer is mounted, or where it is located on the hull.

If you don't see the false echos when the engine is off, it may be necessary to reroute the transducer cable to keep it away from the boat's ignition wires. You can get transducer extension cables if necessary. Also there are filters that you can buy that suppress alternator noise buy attaching between the battery and the engine.

Another common cause of false echos from electrical interference is a transducer cable that has been cut and spliced.

I hope this information helps. Please reply if you have any questions about my response.

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