How to Install Wiring for a Second Light Fixture All of these wires are already located at the existing light fixture, so the easiest method for adding one or more light fixtures is to extend the wiring from the existing light fixture to the new location of the additional light fixture. Related searches for how to wire a new light fixture wiring a new lighting circuitno ground wire light fixturewiring a ceiling light fixturehow to install a new light fixturenew light fixture old wiringhow to replace light fixturehow to wire lighting circuitslight fixture wiring size