You can get this stuff called two stranded lamp cord. What I did was buy a set of running lights and mount them, the mounting instructions are on the package. Then, I put a small battery charger clamp on both of the two strands of wire in the lamp cord. Then, I attached the other ends of the wires to my running lights. All I did then was zip-tie the lamp cord to my gunwale, and turn on the lights by attaching the battery clamps. You could hardwire the cord into the same clamps your trolling motor uses and install a switch too, but I didn't bother.
PS: I bought white lamp cord, which I think looks pretty good ziptied up to the gunwale rail on a small boat.