Fish Finder Hookup

[Basshopper]

some background information for my question....

My Humminbird fish finder gave up the ghost and I ordered a new one. The dead one is hooked up to my 24V trolling batteries but before it stopped working, I had one of the two trolling motor batteries( that are hooked up together as a 24v operation) short out and it caused the fish finder screen to blue out or completely fade out when I ran the trolling motor. At the time I didn't know that one of the batteries shorted out other than the trolling motor was weak. I knew something was going on since I had fully charged the batteries the night before so I pulled out of the water and had the batteries tested and sure enough one was shorted out. I think the shorted out battery had a negative or damaging effect on the fish finder unit but not sure?

My question....
I was thinking about hooking up the new unit to the cranking battery as I wouldn't think a fish finder would pull enough amps to drain the crank battery during a full day of fishing but I thought I should seek a second opinion to see if this is a good move or not?

Let me know what you think if you have some experience with this situation..

Thanks in advance

Basshopper

 

[JDK]

yes i have never heard of a fishfinder being hooked to the trolling motor battery.. it needs to be hooked to the cranking battery. i would also suggest some kind of circuit breaker..

 

[ditchdoc666]

always hook acessories to cranking battery run everything all day and never a prob

 

[wrechin2]

That is correct. Every boat I have worked on the wiring, the switched for everything is on the cranking battery. Most depth finders can run for days on a cranking battery and not discharge it. You engine also has a charging system to keep the battery charged.

 

[groomer1a]

On my Tracker the depth finders run off the cranking battery. Only thing on the trolling motor battery is the trolling motor.