I have just put new (used) fish finders on my Nitro boat. Every time I push down on the trolling motor power button, my fish finders either flash and beep or just cut out. My Humminbird Wide One hundred cuts out and quits reading. One of my Humminbird 200 DX's beeps and shows a bunch of fish. My other Humminbird 200 DX doesnt show anything different or wrong. Does anyone know what I did wrong? Please help.
