the old green Lo K Tor used 2 6 volt batteries that laid on a plate to = 12 volt system so if it looks like that just snip the 2 main wires and add a 12 volt flasher battery. The still old lo k tors that were brown may have the plate or just 2 wires. These machines are ok for marking bottom and fish. They most likely will have trouble marking a ice jig. If you jump to a Lowrance 2000 series you would be better off as these will mark bottom,fish and jig.