Go for the connections first. Loose or bad your toast. Looked around the net and this link is representative of the results. http://www.thebassbarn.com/forum/9-tackle-box/109176-lowrance-problem-need-help.html

The Hull Truth (THT) board has a lot of discussion also. Mostly EC & the Gulf folks but problem stays the same.
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Dazed and confused.............the fog is closing in