I guess the first thing to try it to borrow a buddy’s puck, connect it to your unit, and see if that solves the problem. Or take your unit to a gander/sportsmans warehouse/cabelas/reeds and have one of their guys check the unit with an in-stock puck. Quick diagnosis and a quick fix (replace with new puck) if that’s the problem. I ran into that problem (and solution) with a Lowrance unit on my crestliner a couple of years back.
jhalfen
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