Today we're going to be replacing the wiring on this trailer. We'll be replacing a 4 pole flat, as you can tell this one is pretty beat up and worn, so it has to be replaced. We're going to cut this wire off and we're going to replace this brown wire also. We're going to cut this loose and pull the rest of our wire through, on this trailer here it's pretty open so we can reach the wiring. Just in case though, if your wiring was run in conduit and you're replacing it, don't pull all of this out yet. We'll actually tie on the new wires and use these wires to pull them through. We're going to cut off all of this old wire here, and we're going to take off this old light too. I would like to point something out on this 4 pole flat, you'll notice there's actually 5 wires coming out of it. What's happening is on the inside of this pin, which is for the running lights, has two wires coming out.