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You first have to tell us what kind of rubrail you boat has, and if it is original. If you have the white one-piece rubrail, the wires run interally inside the hull. If you have the black rubrail insert, the wires run under that.

In either case, there should be place on the stern sidewall where the wires come into the inside of the hull, usually indentified by a terminal block placement.

Whaler uses light gray wires for navigation lights, the industry standard.

You can find photos of the standard stern light configuration on this site. Look at the Whaler parts section. Specialty Marine sells the components for a stern light installation, so does Twin Cities Marine.