Fishonjohn, thanks for the details but we have through all the wiring, updtates, and transducers over and over. My mechanic has done hundreds of these installations as he was the former lead mechanic at NR.

The problem is now solved and it was the NEP the entire time. One of Lowrance techs was at the boat show and informed me of a bulletin issued over a year ago regarding interferrence with the NEP1 and the fix was a new NEP2. Neither of those solved the problem. What solved the problem was elimitating the NEP all together.

I think the bigger problem is that every "tech"/csr I have called at the 800# has never heard of this bulletin and some didn't even know what a NEP was. If someone would have just mentioned a year ago about this bulletin, I wouldn't have spent thousands $$ in diagnostics. Unbelievable to hear the number of people that have experienced the same poor customer service experience and quality control issues.