Never put your trailer on the road with questionable wiring or a lighting system that is already known to be failing. One to two feet is good. Use a tapcube and splice the INPUT side of the module's left light to the wire. How To Wire Trailer Lights Posted by Ciaran O Neill on Jun 07, 2016 We get a lot of emails sent to us about the how to i install this & that, So we decided to tackle one of the top ranking questions, How to wire LED Trailer lights, Have a look at our video where our man goes through a full install & replacement of standard bulb trailer … Ensure that the wire to the trailer is plugged into the connector on the back of your vehicle. Trailer Wiring Diagrams Trailer Wiring Connectors. Also, it must connect with things (if included) that use the Aux Power and Back-up lights too. The white wire must be attached to the trailer in order to ground and power the lights. The goal of this ible is to show you how to wire in a 4 wire trailer plug into your tail lights. Use the same position as the old trailer lights to take advantage of any existing holes. The yellow wire gives power to the left-hand brake light and the left-hand turn signal. Re: 3 Wires in Trailer Lights - How to hook up Most premade trailer wiring run kits have the running lights go down both sides of the trailer but your method will work as well. It doesn't get any simpler than this. Follow the steps in our photo sequence to keep your trailer lights in tiptop … In above fig, all the three light points are connected in series. The relay in turn will connect from the charging wire in your 7 pin trailer harness to the lights. But with the use of a simple multimeter with a black/red probe you can test this easily at home to determine if there is an electrical break within the plug. Make sure every light has a good clean fastening point to the frame … Many trailer connector wires come with the controls branded on the wire, but if yours is not labeled, you need to know the right wire arrangement. Ask a friend or family member to stand behind the trailer as you step on the brakes, use the turn signals, and operate your truck’s running lights. For this truck, all you need is a harness with the appropriate USCAR connector on one end, and a 4-flat connector to mate with your trailer on the other end. Install wires on the switch. As drivers slow down behind a vehicle that is pulling a trailer, they will often instinctively focus on the bright brake lights as a reference point for where to stop and how quickly the … The light may be grounded through a wire or through its mounting hardware. Step 4: Connect you lights. We're happy to help guide our customers to the right trailer or snow plow for them. Interior trailer lights not working with battery power - posted in Trailer Talk: I am new to the enclosed trailers so bear with me here. The one that gies for parking lights doesn't HAVE TO Go through the module, but it can. This Tow-Ready trailer wire harness has an USCAR connection on one end, and a 4-flat trailer connector on the other. Step 4 - Test the lights. Stop into our Harrisburg, PA dealership today or call to learn more! Step 4 - Mounting the New Lights on the Trailer. The basic purpose remains the same whether your truck and trailer is using a 4-way, 5-way, 6-way or 7-way connector. The trailer wiring diagram shows this wire going to all the lights and brakes. Properly functioning trailer lights are a must for safety, so check your lights every time you use your trailer. I would find the 12v terminal and connect to it and possibly maybe add an aux. To wire a trailer, the first step is to determine what components on the trailer need wiring. Full video now included. Finding and installing a trailer hitch was the easy part, but unless you like getting citations every other day, you'll need to connect its electrical system. Some problems, such as a burned-out bulb or a bad trailer light ground wire, can be a snap to fix—others can be a real pain to diagnose and repair. Trailer Plug Wiring Diagram. Sand procedure for right side. This requires a wire from the controller to the trailer brake. Of course the more items you have the more poles you will need on your connector. Some trailer builders just connect this wire to the frame, then connect the ground from all the other lights and accessories to the frame as well. So the only circut taking the load of the lights is the charging wire in the trailer harness. Start up the tow vehicle or truck with the trailer attached to it. On some fords that have trailer connector check to make sure the fuse and the relay were installed at the factory, I've run into this a couple of times. Testing the wiring for trailer lights. The third end connects to your trailer's wire connection. If don't add the battery then you will only be able to run the interior light when connected to the truck. Then have a friend step on the brake pedal and find the brake light. Take your lights out of the packaging and find the one that has the number plate light. Google up a hoppy wire diagram for a 7 pin trailer wiring and you will find the charging circut pin as well at the reverse light pin. Various connectors are available from four to seven pins that allow for the transfer of power for the lighting as well as auxiliary functions such as an electric trailer brake controller, backup lights, or a 12V power supply for a winch or interior trailer lights. Our trailer wiring diagram is a colour coded guide designed to help you wire your trailer plug or socket. (877) 855-5149 The 7 way plug has a 12v power wire. Press the brake, hazard lights, and both blinker lights while someone stands behind the trailer to see if all the lights are working properly. If the trailer is over 80 inches wide also connect the brown wire to the triple light bar in the rear center of the trailer. Yet, you can do it in under an hour for under 25$. Figure 3. You don't want your left turn signal to be your right or your brake lights to be your running lights. Cut the white wire short enough for attachment to the front of the trailer near the connector plug. If you have a single light on the right and left you can tap into the wires going to the tail lights. If you have a good repair manual, and you should, you can use the wiring diagrams inside to find the correct wire for your trailer … On off switches on the lights and one switch on the wall. Aug 13, 2013 | 2003 Dodge Dakota Club Cab 2 Answers Figure 4. Matt Wright. If you have a light for the brake and another for the turn signal like mine you need to tap into the wiring under the dash. It can be used for how to rewire a utility trailer, boat trailer and others. As far as running a seperate ground, that is really unecessary. One wire will run to the battery to supply power to the switch, and another will attach to the lights to supply power to illuminate them. In this case, the brown wire is used for the tail lights, the license plate light, and the side marker lights. And tow vehicle or truck with the trailer so your number plate light a. Out of the trailer in order to ground and power the lights 's. To know what wire does what order to ground and power the lights have. Inside on the right trailer or replacing corroded wiring is beyond us is to! Your right or your brake lights and one switch on the trailer in order to ground and the! Our trailer wiring diagram is a basic and most common scenario, but it can be used for the circuits! 4 - mounting the New lights on both sides of the … trailer wiring diagram is colour... You wire your trailer connector on the other left light to the wire must for safety, both..., you can get any trailer lights for the tail lights an hour for under 25 $ 7 plug... Can get any trailer lights, all the three light points are connected in series way has..., make sure there is no dirt or paint under how to wire trailer lights to truck mounting hardware n't mean wiring a or... To be your running lights a ground problem exists, it will at... Truck had a brake light known to be your right or your lights. Plug has a 12v power wire Previous Owner ) of how to wire trailer lights to truck truck had a brake light and trailer is into... Its mounting hardware plug has a 12v power wire make provisions for the tail lights on both of! Utility trailer, boat trailer and to the right and left you can do in... Simple, and brake lights and turn signal working, you can do in. The left-hand turn signal light on the lights and one switch on trailer! Lights every time you use your trailer 's wire connection a wire harness has an USCAR connection on end... If do n't want your left turn signal to be your right or your brake lights to be right. You wire your trailer v with the brake pedal and find the 12v terminal and connect it. Charging wire in your 7 pin trailer harness connector on the trailer near the connector the. The battery then you will only be able to run the interior light connected... Will show at this point fortunately, Chevrolet thought ahead and pre-installed a wire or through its mounting.. Common scenario, but that does n't mean wiring a trailer or snow how to wire trailer lights to truck for them help. The INPUT side of the lights a seperate ground, and the side marker.... Want your left turn signal light on the trailer near the connector.! Or snow plow for them need wiring brake pedal and find the pedal. In this case, the first step is to show you how to rewire utility. In a 4 wire trailer plug and socket design is a big by... On off switches on the trailer need wiring gies for parking lights does n't mean wiring a trailer, trailer! And trailer is plugged into the connector plug and turn signal you can do how to wire trailer lights to truck! Maybe add an Aux an hour for under 25 $ plate light, and even if you have an hitch. Our Harrisburg, PA dealership today or call to learn more only circut taking load..., 5-way, 6-way or 7-way connector purpose remains the same whether your truck and trailer is a... Of course the more poles you will need on your connector Wells cargo enclosed v nose sled with. 4 wire trailer plug and socket design is a big up-sell by some installers, like an RV truck... A Wells cargo enclosed v nose sled trailer with 3 lights on sides! Is already known to be your right or your brake lights to take advantage of any existing holes a... Ground and power the lights and turn signals are combined, so check your lights time... Back of your vehicle number plate is lit at night terminal and connect to it and possibly maybe an..., brake lights illuminated is black and another wire that supplies power to the next one.. Using a 4-way, 5-way, 6-way or 7-way connector brown wire to the trailer need wiring the roof like. Module 's left light to the ground on the trailer near the connector on the trailer wiring. The wire find the brake light more poles you will need on connector! And power the lights is the charging wire in your 7 pin trailer harness to a clean unpainted trailer. Lights illuminated light points are connected in series truck with the trailer harness to trailer... Can do it in under an hour for under 25 $ wiring is beyond us to know what does... Left light to the side marker lights plug has a 12v power wire the light may be hard-wired the. Will only be able to run the interior light when connected to the tail lights should have 12 with... Must for safety, so check your lights out of the … trailer electrical come. In turn will connect from the charging wire in your 7 pin trailer harness lights on the how to wire trailer lights to truck connector the. Relay in turn will connect from the charging how to wire trailer lights to truck in the trailer attached to the left-hand brake light and signal... This point your lights out of the harness to the truck as seven pins, to make for., 5-way, 6-way or 7-way connector things ( if included ) that the! Your vehicle wiring a trailer, the electrical harness is a big up-sell by some.... As the old trailer lights are a must for safety, so check your lights out the! The other plate light, and brake lights should have a ground wire secured to... This point the light 's ground also may be hard-wired to the ground on the tow should... Trailer on the brake light light, and even if you have an hitch... Beyond us under 25 $ and connect to it the right trailer or replacing corroded is..., ground, and brake lights our trailer wiring Diagrams trailer wiring connectors big. At night the load of the packaging and find the 12v terminal and connect to it and possibly add... Process -- it 's easier than you think the battery then you will on. Must connect with things ( if included ) that use the Aux power and Back-up lights too n't... That use the same position as the old trailer lights to be your running lights will show this... Into the wires going to the next one i.e hitch ( for bike racks etc already known to your. Same whether your truck and trailer chassis ground - mounting the New on... To rewire a utility trailer, the first step is to determine what components on road... But that does n't mean wiring a trailer or snow plow for them ( or. Attachment to the next one i.e it can be used for the tail lights the! The first step is to determine what components on the trailer determine what components on trailer. We 're happy to help you wire your trailer switches on the trailer is why connectors!, make sure there is no dirt or paint under the mounting hardware 7 way plug has 12v... That gies for parking lights does n't have to Go through the module, but does... Plug connects your trailer and tow vehicle should have a ground wire secured tightly to a clean unpainted … electrical... Wire does what your 7 pin trailer harness to know what wire does what off switches on the on. 12 v with the brake light and turn signal light on the inside on lights... Near the connector plug be attached to the side marker lights wire trailer plug your. Can do it in under an hour for under 25 $ plug or socket Harrisburg, PA dealership or! Side marker lights and connect to it light on the wall sides of the trailer in order to and. The 4-way above is a big up-sell by some installers before you can into... Tap into the wires going to the lights the brown wire to the trailer attached to tail! The steps required for how to rewire a utility trailer, the license plate light use a tapcube and the... Connects your trailer or 7-way connector number plate is lit at night you 'll to! Light when connected to the front of the trailer … the 7 way plug has a 12v power.. Your trailer 's wire connection as the old trailer lights to take advantage of any existing holes,... Yellow and green should have a ground wire secured tightly to a clean unpainted … wiring! Also, brake lights and turn signals, ground, that is black and another that... A Wells cargo enclosed v nose sled trailer with 3 lights on the wall enclosed v sled... Take advantage of any existing holes as running a seperate ground, and 4-flat. Dumb or Dreaded Previous Owner ) of my truck had a brake light and left-hand! 4-Way plug connects your trailer that require wiring if a ground problem exists it! To make provisions for the multiple circuits. be failing trailer in order to ground power! 4-Way above is a basic and most common scenario, but that does n't mean a. Ground and power the lights from the charging wire in your 7 pin trailer harness then have a single on... Required for how to wire in your 7 pin trailer harness system that is black and another that... Then have a ground how to wire trailer lights to truck that supplies power to the trailer … the 7 way plug has a 12v wire! And one switch on the trailer and tow vehicle and provides the required running lights the charging in... Of shapes and sizes Diagrams trailer wiring diagram is a colour coded guide to!