help with gps/fishfinder

[t8764]

Most of the time when I start my boat my fishfinder freezes or goes to a screen with just a bunch of lines on it. I am trying to figure out how to pervent this. I have the gps wired to a fuse block under the helm and that wire is ran back to battery switch and a ground on battery #1. I check all conections and they are tight where to go now.
Thanks
Erik

 

[Barnacle_Bill]

Re: help with gps/fishfinder

Have your battery load tested. Meanwhile don't turn the unit on until after you have started the motor.

 

[t8764]

Re: help with gps/fishfinder

It does it with both batteries. I wouldnt think I would have two bad batteries? Used one today for about two hours of trolling motor and still started the the motor, but still froze my fishfinder. I try and turn off the unit but sometimes forget when I am getting ready to go to another fishing hole.

 

[MH Hawker]

Re: help with gps/fishfinder

It sounds like the system is pulling so much voltage that its dropping it below the finders threshold to operate, I would first go over ever connection on the accessory circuit its hooked into. One of them is bad some where.