20 Most Recent Garmin FISHFINDER 300C NIC () Questions & Answers

My experience as a user is that turbulence around the transducer can cause mine to flash and the depth to remain static.Is your fault affected by speed? Sounds to me that you have a faulty connection causing the transducer to "not register". I'd check connections and also the integrity of the transducer. Hope that helps... Best of luck

Hello Alexpreerado,

I understand that you are having a problem with your Garmin fishfinder 300C. When in the water the unit is not turning on, however when out of the water the unit will turn on. I want to see if the unit will work in simulation mode.

To do this you will need to follow these directions:
When powered on select CONFIGURE, SYSTEM, SIMULATOR, ON.

If the simulator works then you know that the unit is working. Then go back thru the same way and turn the simulator back off,

Your unit is equipped with a self diagnostic unit that if there is a problem it should power and give you a fault reading. If the unit is not powering on while in the water you are loosing power to the unit. Put the boat back in the water and check the voltage going in to the unit. You may find that you have a short while the boat is in the water.

Post back with what you find from the above possible solution to the problem. And I will give you some more possible problems and solution to your problem.

Thank you for choosing FIxYa.com

Justinbur167

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.

All transducers should read 0 ohms or close to it. If not you most likely have a broken pin in the connector or wire.

I can't remember correct setup but make sure that box is powered and connected to GPS in right input. With no power to box it won't be discovered by head unit.

Place your ear against the transducer with unit ON. You should hear it 'tikking' ( tic tic tic ) then the transducer is ok...

garmin_products_out_of_support_list_20140207 Here is a pdf for Garmin. you should be able to contact them though email. Good luck