i ACCIDENTLY hooked the wires up backwards on a adapter from a small vexilar battery to plug my gps into otherwise it would drain the batteries in no time, it blew the fuse in the power cord like it was spose to, thought that i was okay putting a new 1 AMP fuse in and id be good to go, it turned on fine and everything, went in the garage to grab the auger came out and it wouldnt turn on or notin, good batteries and everything, sent it to lowrance they sent me a refurbished one with a power cord, that doesnt work, but atleast i have a gps now… i am very please with thier customer service.