If you are rigged like me, you have a fuse for the unit power, and a fuse for the network "T"(that the GPS plug is plugged into), if so, verify that fuse....and don't just look at it, test or replace. My brother in law has a new Furuno that I put in, and it's blown the fuse twice, and hopefully just has a bad power cord(arrived today). They all use a 3 amp fuse to hopefully save everything when one has a "power hit"......"Power Hitter".... wasn't that a football shaped thingy that I might have had in high school? Good Luck, Tom