Just because the problem just started recently does not mean that it isn't related to them. Typically, the chances are that if you have added in something to the factory circuit and you have a failure, it will likely have something to do with that addition you made, whether it be a connection that has broken loose or whatever. I would still check them out. As for a wiring diagram, I don't have one myself, but if nothing else, you could probably find one in a haynes manual or something.96tacoma said:i dont have a hitch but i do have altezza lights but ive had them in for quite a while and the problem just started recently