@ Greg

I think it is being causes primarily by trolling motor battery. I need to look and see how it is hooked up as I had my local marine guy do it for me. It seems when I run the trolling motor on high that it gets like this. Also when I am using my outboard. I only have a 25 hp so top speed is around 20 mph.

When I turn the unit on it is fine. When I am just idling it is fine. When I give big motor throttle or turn trolling motor on high is goes haywire. Have to turn it off and then turn it back on again and it is fine.

So you are saying that it should be ran directly from unit to cranking battery?