If I got a set of two trail-tech lights to put on my z250 and just wired em up to my battery and ran them with the stock lights would I have any problems? I need additional lights for night riding.

 

It all depends on the wattage of the bulbs, and the output wattage of your stator. You add up the stocker lights, the new lights, and any other accesories you may be running. If it is under the stator output, you are good to go.