have you checked the cords that plug into the back of the unit? this was happening to me and i was looking at all these things and then i realized that the power cords weren't completely plugged into the back of the units
Mako LSU Fan Baton Rouge, LA Member since Nov 2011 273 posts Online
re: GPS/fishfinder powering off ????(Posted by Mako on 2/11/13 at 10:22 am to AlxTgr)
I have the same problem with my Garmin GPS. I have yet to solve the problem but, the Garmin tech said I neeed to have at least 11 volts to my GPS and anything less will cause it to shut down. I used a vlot meter and I am getting 11.5 volts to it with nothing running. I have other issues so I am sending it back getting a replacement.