Putting Christmas lights on a truck is a fun and festive way to spread holiday cheer and make your vehicle stand out. The first step is to gather the necessary supplies, which include a set of Christmas lights, a tape measure, a ladder or step stool, and a power outlet nearby. Next, measure the perimeter of your truck and determine how many strands of lights you'll need to cover it. Then, begin by plugging in the first strand of lights and securing it to the top of your truck.