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Posts: 546
Location: MN | All of the information provided is good advice. I had the same issue on a boat I bought a few years ago when I was swapping out a 5" for 10" display. It may not come to mind at first, but one culprit can be the factory wiring being too small for the application. Some boats are only rigged with wire that is adequate to carry voltage for smaller units and their lower power draw.
Consider running new wires to power these larger units. Many times the wire to our electronics is too small, especially when running long spans, hence the front graph dies first.
Consider running 10 or 12 gauge wire for power leads. This will eliminate issues with resistance, which is like friction for electricity and limits the amount of voltage that is transferred from power source to fish finder (electricians, please forgive the crude analogy).
This will also eliminate a variable in your issue with your unit dying upon cranking your engine. Most likely you need a larger group 31 battery with good reserve capacity, but the larger wire will help ensure the necessary voltage gets to the units. Do it once, do it right.
Edited by mtcook16 2/15/2018 11:41 AM
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