You'll have to trace out both ends of each individual wire see where they go, and hook them back together. My bet would be that somewhere back in the harness the original color is there. You might have to cut a lot of tape, and remove a lot of wire loom to find it. It is best not to have splices, but if done right (solder and shrink tubing) they work as well as the original. Always stick to the original color, so a wire diagram will work later.