Question about Humminbird 595c GPS Receiver

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Low Voltage Hi.... Would you be to give me some advice on my 595c Humminbird GPS Fishfinder? when switched on for use a message on the screen "Low Voltage" appears after about 20-30 mins. If I don't switch it off it will turn off its-self. Thanks Norman

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  • Anonymous Mar 23, 2014

    I tried to ajust the light.

  • Anonymous Mar 24, 2014

    i cant find it



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The power inverter board is most likely starting to fail. The unit should be sent in for factory service. They will change the board and test it out to make sure that another board did not cause the fault.

Jerry G.

Posted on Jul 26, 2008


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I get a low voltage message and unit powers down


My name is Mike. I understand your problem. What I am doing to help you the best I can, is giving you the manual to download in PDF as well as a support number and other information to help you out. Also giving you my direct page to my Services I offer. Thanks SO Much , Mike.

Thank You, Again. Please rate my solution for my free help and some nice comments back would be grateful. God Bless, Mike

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I just installed a 595c gps on my boat. I used it the first time with no problem. The next time I went out, it would not start up. The power comes on but only 2 symbols show up on the left hand side of...

If you know of someone else that has the same setup on there boat you can slide your unit on there mounting system and see what you get. This will tell you if it is the unit or the transducer. I would check my voltage to make sure you have 12 volts at the end of your power cable. If you do not know of anyone with the same setup you can contact our Customer Group and they will be glad to help you out. There number is 800-633-1468.


Joby @ Humminbird

Jan 04, 2011 | Humminbird 595c GPS Receiver

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My 997c has a low voltage message on the screen every 20 minutes.

When you have a low volt warning, it is simply because you have low volt. To confirm this use a multi-meter and check the voltage at:
A- the power connector for the GPS
B- the battery directly.
If A is bellow 10.5 V and B is above 11,x you have a cable problem (long or/and thin cable). If they are more or less the same, but bellow 10.5V you need to check your electric system.

Oct 23, 2009 | Humminbird 595c GPS Receiver

1 Answer


hello there:
here is a few links that have the manual that you can download for free
  1. Humminbird 595C Manuals, Support and Troubleshooting - Fishfinder GPS Free download of Humminbird Fishfinder 595C User Manual. ... Humminbird Fishfinder 595C GPS. Need a manual? HUMMINBIRD 595C MANUAL - 96k - Cached
  2. Humminbird GPS Manual and Support Information: User Manuals: Retrevo ... largest collection of user guides and manuals on the web. ... Humminbird Fishfinder 595C. Operations Manual. Humminbird HDR 400G. User Guide. Humminbird HDR 400I - Cached

Sep 16, 2009 | Humminbird 595c GPS Receiver

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My Humminbird Matrix 67 shows 11.3 volts on the

Go into the menu (press menu twice) and look for the alarms tab. There is a setting you can change for a low battery warning, make sure it is set to off or as low as you can get it. Also it may be time for a software upgrade (available at a service center)
Best of luck!

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If your unit is a portable unit (takes 8 'AA' batteries), make sure that the batteries say 1.5 volts and not 1.2 or 1.3 volts as these won't have the right amount of power.
If not, make sure that the power cable (where it plugs into the sounder) is installed with the small notch pointed towards the top.
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according to the manual... 10-20 VDC

Please rate this solution.. thanks

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Cant see my screen on my humminbird fish finder any more

The most common failures:
It may be the power inverter board, and or the backplane lamps, or the screen, or the screen driver board.

The unit will have to go back for factory service. They will use board substitution to service it. Once the defective board(s) are determined, they will leave the new board(s) in the unit.

Jerry G.

Jul 26, 2008 | Humminbird 595c GPS Receiver

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Humminbird 250 DX Fishfinder

go to you will have to sign up with to get the download. bought a boat with the same one download the manual for it here.

Jan 12, 2008 | Humminbird 595c GPS Receiver

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