I have a Humminbird Gen 1 Helix 10 SI and a Lowrance Elite 7 HDI. Bought a Wal Mart Marine Maxx 1000 cranking amps battery about 6 months ago. Just had it tested after 3 days charge and it tested 12.7 amps and 1224 CCA. Every time I turn my boat on to run to another spot my Humminbird shuts off. This is my second battery where this happens. Interesting fact. When I turn the backlight down to 3 or 4, the graph doesn't shut off. Can't figure this one out. Anyone have an idea? Thank you

What size power wire and where is it connected?

What does the voltage read on Hummingbird display. Sounds like a bad connection some where in the power chain.

That�s a what I�m thinking. ^^^

12 gauge wire for thr power cable.

Power cable ran straight to the starting battery, not a fuse panel.

That should fix the issue

Does it do it every time or later in the day? Sounds like you need to run a different size wire or you have a bad connection somewhere.

Replace hot with fusible link and ground wire with tinned marine wire from locator to battery. Wiring could have gone bad anywhere along its path if a good quality wire was not used during original installation.

I was having the same type issue. I ran a dedicated #12 fused power supply to the graphs. It all stopped ! No more shut downs and loss of tracking on gps. Not exactly sure where the issue was but I figured the graphs were more voltage sensitive ?? It did it only on cranking the big motor.

Yep going to run some dedicated wire to it. Thx all

once you are done, I will help you launch.

Use marine grade, tinned, copper wire. Also , turning backlight down to 6-7 saves a noticeable amount of battery towards the end of the day. Like when you don't crank big motor all day till ready to go in.