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Author Topic: [Wiring] Fishfinder reading low voltage  (Read 375 times)

Offline Adam Mihara

[Wiring] Fishfinder reading low voltage
« on: October 10, 2018, 02:29:12 PM »
So in my last couple outings on my jon boat I was reading a low voltage 7.9v-8.4v on my fish finder and when I would go above 40% it would flicker on and off. Something seemed amiss because it usually read 11.8-12.4v. My boat was a little sluggish on my 70lb 24v Maxxum and very noticeable at the end of the day. I checked all my wiring and it was 100% fine.

Back at the garage, I busted out my multi-meter and checked each battery after a full night of charging. One read 12.2v the other read 10.2v What this means is I "dropped a cell" in the one battery. This can happen if the internals of the battery has been damaged by vibration or knocking. Basically one compartment inside the battery had collapsed and was no longer holding voltage. 

You can tell the age of a battery based on the round sticker either on the top or side. These indicate the month and year of manufacture. I always keep a spare battery (3/15) on hand. I traded it and the bad battery in for a new set (9/18). The good one (5/17) from the boat will now become my spare. 

Moral of the story, keep an eye on your fish finder voltage. It may save you headache later.

Linkback: https://fishinpedia.com/bass-fishing-forums/electronics-fishinpedia/14/fishfinder-reading-low-voltage/2840/

Offline Jig Man

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Re: Fishfinder reading low voltage
« Reply #1 on: October 12, 2018, 09:44:13 AM »
Keeping an eye on all of your stuff is a good idea.  A fully charged battery in good condition should read 12.6 to 12.7 volts.  When the voltage output gets below 11 volts then most sonar units shut down.
If you're too busy to go fishin' you're too busy.

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