How do I do a "soft" or "hard" reset on the X-75? Thought that was only for the more advanced units. Hmm... Manual whereabouts unknown. Maybe I can find it on line. If it is just a connection issue, I hope it isn't somewhere under the deck. Checked and cleaned all battery terminals and fuses. Cleaned pins on unit. Broke the little plastic "V" shaped locating pin but that doesn't seem to make any difference. Broke the one of my old X-85 too and it continued to work. Wish I hadn't sold it with the old boat... would try swapping it out. Thanks for the suggestions. One question, though... If it were a connection issue, would the unit continue to register voltage of 13+ while connected to charger (unit misbehaves while on charger too).