SOURCE: go about getting operational anual for fish finder humminbird
I found what you are looking for. Go to: http://www.humminbird.com/support/FAQ.aspx?faqid=72
You can download the operating manual.
SOURCE: MY 300 SERIES HUMMINBIRD GPS FISHING FINDER HAS
I would say your battery is not putting out enough voltage. Have it checked at any Auto parts store.
SOURCE: CAN I POWER MY FISH FINDER GOING DIRECTLY TO THE
Yes you can. Basically the red wire goes to the fuse box connection. The fuse box should then be wired into the positive battery terminal. The black wire is the negative ground wire and needs to go directly back to your negative battery terminal or to a common negative buss bar.
SOURCE: turns off
The first thing you need to check is if you have sufficient power going to the fishfinder. Take a multimeter and measure the dc voltage going to the display when the unit is off and also on. If this is below 12 vdc this is your problem. You will need to check for loose connections and possibly replace your battery.
If the voltage is good then the problem lies within the display. Unfortunately, you would have to contact Humminbird directly to return the display for repair or purchase a new fishfinder.
SOURCE: I have Humminbird 525 fish
If you have someone that has the same or simular unit just slide there control head to the base just to make sure you have enough voltage and current to power the unit. If the other unit powers up then there is a problem with the control head. Then you will need to call customer service to get it resolved.
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