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PowerPower / Data cablePower (3 wire)Yellow No ConnectRed (FUSE)+ Black—
seedman, you should have gotten a fuse/fuse holder and two crimp connectors with your power cord. Make sure you connect one end of the fuse holder, red wire, to the red power wire on the power cord using one of the crimp connectors. Then connect the other end of the fuse holder, red wire, to the positive terminal of the battery. The black wire goes to negative. The yellow wire is not used. The other wires in the second cable are for NMEA communications, you won't use them, just tape over them to keep them from touching anything. If you go back to 17 Dec 2013 in this Ice Fishing With Electronics you will find a post I made on the Elite 5 HDI, many things are similar and you may find some help there. You may want to get the Ice Transducer Float Kit 000-10442-001, ~$7.95 retail.
Can I ask what it cost/ I also have a elite7