[Nitrous Al]

I'm not sure if this is the right place for this question, but I want to rewire my tail lights. My passenger side tail light doesn't work with the driving lights on. It works when I apply the brakes or the signal. I changed the bulbs and still nothing. I'm not sure what gauge of wire to use. I think it's somewhere between 22 - 16 stranded copper wire. Anyone know the answer? I'm planning on buying a spool of the wire and building my own wiring harnesses for the tail lights.