What wire gauge is used for tail lights?

[Nitrous Al]

Thanks Chris, I took another look at the wiring harness and learned a lot. (I'm an idiot when it comes to this stuff. I passed my Electrical shop class in high school, but never used my "new knowledge" on anything.) There are five wires coming from the Tail light/Back up light assembly. Under the car, there's a connector that connects "four" wires into the "five". The connector fell apart in my hands when I tried to find out what the problem was. I went to Auto Zone, Pep Boys, a Junk yard and even my local Ford dealership and learned this is a rare connector. Saturday, I'm going to a "Pull it yourself & save" used parts yard and hopefully I find what I'm looking for.