Make sure you put the right lamp on the right side when rewiring trailer lights. Learn how to rewire trailer lights in these free trailer wiring video instructions featuring a certified mechanic.
In this step we're going to talk about the proper service procedure for rewiring our new lamp and the mounting process for our new lamp. What we have here is a whole bunch of extra wiring, so I'm going to take and cut off a significant portion of it. I'm just going to measure out until about here and snip it off. You want to make sure you have more than enough, than not enough, just like so. There I'm going to take and split the wiring and peel it apart. I have my new lamp here and as you can see, you're going to want to make sure and use the right lamp for the right side, being that the other lamp is going to have another bulb melted in it for your license plate light. Once you have that determined, you can take and strip your wiring back. Once you have the wires cut and prepped, you can go ahead and take and crimp on your water proof terminals. These guys right here are great. It's color coordinated. You can see it's a blue terminal, we're going to want to use the blue spot on our terminal pliers. We'll take and get hold of the metal spot where we want to crimp it at and insert my green wire. You might have to give your wire a couple twist to get it to bunch together nicely, just like so. We're going to slide it in and crush it flat, just like so. Once you have it crushed flat, you're going to take and give it a tug, make sure it's on there securely. Go ahead and repeat the procedure for any of the other remaining wires. What I'm going to do now is whip out my lighter and seal up these connections. These are heat activated shrink tube. As you can see, as I warm them up with my lighter, the tubing will shrink and form a waterproof bond to the insulation, just like so. You can see there's actually a little bit of sealant spewing out of the end of that connector. That's what you're looking for. That will indicate that it has been waterproofed by the sealant. I'm going to go ahead and do the other one right now since I've got it in my hands. You can use a heat gun or a mini torch. You can apply a little too much heat to these connectors using that method. And you may burn the insulation. From here, what I'm going to do is take my lamp am hook up my wires correspondingly. Like I said they are color coordinated. Take my green wire and spin it down just like so, insert it into the waterproof butt connector just like that and hold it with my other fingers. You're going to want to hang on to it in a little sandwich there until you can take and slip your pliers on and crimp the connector, just like so. You're going to again want to give it a tug to make sure that you have it crimped down sturdy enough. From here, fetch my lighter back and melt these two shrink tubes. Once you see the sealant starting to squirt out of the top, you know you've got it accurately heated and you have a waterproof connection. Go ahead and repeat that for my green wire connection. Now that we've sealed both connections, I'm going to go ahead and feed my wiring back through. We'll take up for that slack in the wiring with some zip ties just like so. As you can see this lamp has actually two lenses. This is a running or marker light and this is the other rear light and brake light. You're going to want to make sure to mount this light this way, with the marker light facing outside. If mounted this direction, it's going to be upside down and your marker light won't provide its purpose. You're going to take and line up our studs and slip the lamp through just like so. As you can see right here, we have both studs protruding all the way through. I'm going to take and slip on one log watcher just like so and spin on a retaining nut just like so. You want to take care not to pinch your wires between the lens and your mounting bracket. From here, I'm going to go ahead and slip on another. Got a ten millimeter socket on my quarter inch drive craftsman ratchet. And that's all the tightening that one needs to be. Go ahead and repeat it for this one here. That is the proper way to rewire your marker lamp and brake lamp and mount it to the bracket on your utility trailer.