Quote Originally Posted by lil skeeter View Post
tried my new 788ci and the screen would freeze or just turn black with some lines running verticle. any ideas what the problem is. i can unhook it and then hook it back up and it will start up and do the same thing after a while. i think its a short, but i havent been able to make it happen by moving the wires. gonna call humminbird monday, just want some ideas from anyone who has had this problem
Agree you're checking the right stuff. Do start at the source of power at the fuze panel. Be sure all is wired tight there, and then double check the fuze. I had a differnt Humminbird doing the same and it ended up being a fuze that looked okay, but was intermittent.

It sounds to me like its losing power. Might also be losing ground. Perfect check would be to have someone with a similar unit, or atleast one that fits your mount, put that unit on you mount. That would pretty much confirm if its wire/transducer probelms, or just in the head unit itself.