Question about Garmin FISHFINDER 300C NIC ()
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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