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Roadmaster Tail Light Wiring Kit Installation - 2014 Chevrolet Sonic

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How to Install the Roadmaster Tail Light Wiring Kit on a 2014 Chevrolet Sonic


Today on our 2013 Chevy Sonic we'll be installing the Roadmaster Tail Light wiring kit with bulb, part number RM-155. In conjunction with our Pollak 4-Pole Round Pin socket, part number PK11410. To begin our install we'll open up the rear hatch. We're going to be removing the tail light assembly to make it easier to install the wiring harness. To start, we'll go ahead and remove the two fasteners on each side that secure the tail light assembly. Once we remove the fasteners we'll go ahead and pop the tail light housing out. We'll then rotate the light so that we can let it hang here until we're ready to make our wiring connections.

Now with the driver's side done, we'll go ahead and move over to the passenger side and repeat the same process. To assist in popping the tail light assembly out we're just going to be using a flat plastic pry bar. You can also use a flat blade screwdriver. Be careful when popping the tail light assembly out that you don't break the alignment tabs off that are underneath. Now with our tail light assemblies out we'll need to locate a suitable spot for installing the new tail light bulb. We'll be installing it into the back of the housing of the tail light assembly for what is the brake and running light circuit on the car side.

That would be this section here. We'll be installing a new bulb into the back of the tail light assembly and this will run both our running light, turn signal and brake signal circuits. Next, using a one inch hole saw bit we can open up the back of the tail light so that we can install our new bulb and socket. Once we have the hole made we can go ahead and install the socket into it. We'll bend the tabs along the outer edge of the socket as necessary to get a nice tight fit to hold it in position.

With the driver's side done we repeat the same process on the passenger side. Now with our bulb and sockets installed we're ready to start wiring up our new 4-pole harness. This will be the 4-pole harness that can run to the front of the vehicle and ultimately get hooked up to the tow vehicle. For this application we'll not be using the 4-pole plug that's on the end of the wire so we're going to go ahead and cut it off. This will make it easier to route and install our wiring. Next we'll also use a pull wire which can be a stiff piece of wire or in this case a piece of air tubing to assist the routing our wiring down and underneath the vehicle.

Take the wiring harness, tape it to the pole wire and then pull it underneath the vehicle. Now with our wiring fed underneath we'll go ahead and route it over to the driver's side. As we route behind the fascia, we'll go up over the frame and then up behind the driver's side tail light assembly. Once again we'll use a pull wire to assist the routing. We'll go ahead and tape the wiring harness to the pull wire. We'll then use the pull wire to pull it in position. Now with the wiring pulled up behind the tail light assembly we'll go ahead and remove the pull wire. Here on the driver's side we'll only be using three of the four wires. We will not need the green wire as it's for the passenger side turn and break signal. We're going to go ahead and cut that off short. Next, I've got plenty of wire pulled here to run to our harness but we're going to go ahead and cut off some. We'll go ahead and cut it short and then remove the white wire from the cut off piece. The white wire will act as a ground that will go straight from the tail light assembly to the body of the vehicle. Go ahead and strip back all our wires now. We can also strip back the wires coming from the pig tail from our bulb and socket. Black will be ground, brown will be our running light circuit and red will be the breaking and turn signal circuit. For our turn and brake signal circuit we'll take the yellow wire from our 4-pole harness, add a blue butt connector to one side and a yellow wire and a red wire to the other. For the running light circuit we'll match up color for color, brown to brown. For our ground circuit it'll be the black wire on our new bulb and socket side, white wire on the 4-pole harness side and the additional piece of white wire that we cut off of our 4-pole so then we can make a ground that will go directly behind the tail light assembly here to the body of the vehicle. To add three wires to one connection point, we'll twist the two together and then use one of the yellow butt connectors. Measure out the length of wire we need for our ground wire, cut off any excess, strip it back and add the ring terminal provided with the install kit. Then using a self-tapping screw we can attach it directly to the body of the vehicle. When looking for our ground point we recommend to find a location where the sheet metal doubles up for a more secure ground. Once all our connections are made we'll go ahead and wrap up the butt connectors with some black electrical tape to help keep them free from dirt, dust, debris and moisture. Now with the wiring secure we can go ahead and re-install the tail light assembly. Now we'll move underneath our vehicle and secure our wiring as we route over to the passenger side. Once we have the wiring secured, we'll go ahead and cut off the excess and the zip ties. Now we're back behind the passenger side tail light assembly where we started with our 4-pole harness. We'll make sure we've got plenty of length to work with and we'll go ahead and cut the harness except the yellow wire. We'll go ahead and peel away the wires from each other, separating the four. With the protective coating on it it can be easier to cut the coating first. Using a utility knife we'll carefully cut between the wires. We'll give ourselves plenty of working room and go ahead and cut all but our yellow wire. We'll strip back both ends of the cut wires. We can also strip back the wires coming from our tail light socket. The green wire that came over from the driver's side will get cut off as it will not be used. Now with all our wires stripped back, we'll start with the green wire connection that will route to red wire for our tail light socket. Using a blue butt connector we'll connect the two. This will connect the circuit for the passenger side turn signal and brake circuit. Our two remaining connections will be our brown to brown running light circuit and with the two white wires and the black wire from our tail light socket. Each of these connection points will have three wires. Now with all our connections made we're ready to wrap up our connection points with some black electrical tape and secure our wiring as necessary. If we had a 4-pole flat umbilical connection going from the towed vehicle to our towing vehicle we would leave the 4-pole flat connector on here. However, we're going to be using a 4-round connection point so to make it easier in routing our wire, we're going to go ahead and cut off this connection as we'll be rewiring it anyway. We'll then take the 4-pole harness and feed it back underneath the vehicle where we'll take it and route it up to the front of the vehicle near the license plate frame to the base plate wiring plug mount. With our wiring routed and secured we'll go ahead and reinstall the tail light assembly here on the passenger side. Next we'll move underneath the vehicle and start routing our wire up to the front of the vehicle. Keep in mind when routing any of your wires, stay away from moving components such as steering or suspension or excessive heat such as the exhaust. There's one push pin fastener, two bolts and three T20 Torx bit fasteners that will need to be removed. With our wiring here to the front we can cut off any excess. We'll then strip back the wires and install them into the four round connector for this application. To install the wires we'll need to remove the set screw here in the housing. Open up the front and we'll push the connector out. Then we'll take the four wires, run them through the housing. Following our Roadmaster guide we'll go ahead and install the green and looking at the plug will be the upper right hand corner. Then our yellow, then just below the yellow will be the white wire. To the lower right will be our ground and then below the green, left lower, looking at the plug again, will be the running light circuit. Once we have our wires installed and secured we'll then go ahead and reinstall them into the housing, re-installing the set screw. Now we can go ahead and mount the new 4-pole round connector. Now that our connector's secured this will complete the install of the Roadmaster Tail Light wiring kit with bulb and socket part number RM-155 in conjunction with our Pollak round pin socket, part number PK11410 on our 2014 Chevrolet Sonic. .


Questions and Comments about this Video

Andrew N.

So you are adding a separate socket and bulb to each tail light assembly, that will be connected directly to the tow vehicles trailer plug, with no connection to the Sonic electrical system, no diodes etc? Did I get this right?My RV dealer couldnt figure this out and ended up giving ne a pair of magnetic lights to stick on the roof..Thanks for your information.Andy

Etrailer Expert
Reply from Rachael H.

Yup Andy, you've got it. The extra bulb and socket is wired independently of the Sonic wiring and works in the same way the magnetic option that you already have does. If you do have a 2014 Sonic then this will work for you. if you vehicle is different you may want to consult our vehicle fit guide since some vehicle taillight assemblies do not have the proper clearance to install this bulb and socket kit.

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