I would use 14 gauge wire(marine wire is best but you can use automotive wire, 1- inline fuse holder,1-3amp fuse, 3- 14ga. butt connectors easiest (or best to soldier and use heat shrink tubing), 2 alligator clips or whatever to hook wire to battery. With the inline fuse right at the battery on the positive side of battery. Now this is just my two cents worth. And there is several other ways and sizes of wire that can be used.