This is the most common scenario. Video tutorial on how to wire trailer lights. First starting out with a center drill and then finish up with the correct sized drill bit. Fortunately, almost all wires you need (except for a brake controller wire) connect to your vehicle’s tail light assembly. Get it as soon as Wed, Jan 6. In this case, you will need a set of wiring taps and a pair of pliers. Thanks for the clear explanation of the trailer wiring schemes. © 2021 BullyUSA.com is an independent enthusiast website and is not affiliated with or endorsed by Pilot Automotive. 4-Way trailer connectors are typically used on small trailers such as boat, snowmobile, utility and other trailers that that do not use brakes. This is the wire for the right stop/turn signal light. How to Wire Trailer Lights: Video tutorial on how to wire trailer lights. 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. Install the grommet and pull through the wire. Built with quality and strength that will match that of your rig, our truck accessories are custom designed to enhance the appearance and function of your vehicle. This vehicle-to-trailer wiring harness creates a standard trailer wiring connection by plugging into vehicle harness and tail light assembly, and then routing the 4-way harness to the rear end of a vehicle. This connector is commonly found on most light-duty trailers. On the back side, I have made it a few inches away from the back skirt to reduce the chance from being gather in mud build up or if a hook from a strap is connected to the bed, it won’t clip on the wire accidentally. Ie pins 4 and 1 are reversed and 6 and 7 and 2 and 5. Click on the image below to enlarge it. Next is wiring up a license plate light if you chose that option. But you didn't use a grommet at other locations that are just as prone to chaffing through he casing and insulation and short. Just wire the appropriate wires to the ones described above and then wire the ground to a good ground at the frame. Trailer Light Wiring Basics. The license plate light would run off the parking lights, known as the brown wire so you can pull the power supply from either side. Be sure to hit that SUBSCRIBE or FOLLOW button! This is just a standard 4 way connector with a ground, parking, and signal or brake lights. RC Arduino Domino Layer With Bluetooth App Control. The circuits are for left and right brake lights and running lights. Again the wires are taped up with the casing. Attach the Ground Wire to the Trailer. The lights are connected to the bed, but the tongue is a movable piece which may have grounding issues at the pivot point. Feed the exposed wire into the casing, this will go against the already installed casing and taped up after holding everything together. I used adhesive filled shrink tube as well for a waterproof seal. For length, have the plug extend a couple inches past the end of the hitch so it has a bit of movement when turning, but not tight where it can put strain on the wiring, drag on the ground, or become unplugged. I soldered the extension, used adhesive filled shrink tube to protect it from moisture and matched the existing 18 ga. wire. You guys helped me a lot. Andrew Demaree is Bully’s resident technical writer and automotive expert. complete kits are available (see product description); offer a concealed terminal with a dust cover for protection against the elements. Here is the brand new generic wiring harness. If your late model car, truck, or SUV does not have a trailer package from the factory, you may go with a T-connector made specifically for your make and model. Now for the wire and casing, it has been cut longer, especially the casing since there is a few inches of wire coming from the lights. Thumbs Up! To make this tutorial easier to understand, I will be flipping the trailer on it’s side so everything is easily viewable. SUZCO 25 Foot 4 Wire 4-Flat Trailer Light Wiring Harness Extension Kit, 4-Way Plug 4 Pin Male & Female Extension Connector & Wishbone-Style with 18 Gauge White Ground Wire with SAE J1128. There is enough access wire at the tilt pivot too. While the basic configuration is a 4-way flat connector that features one female and three male ends, you may come across connectors with up to seven pins for additional functions that require wiring, including electrically actuated brakes, power source for a winch, etc. You’ll need to plan where to run the wiring, considering this is a tilt trailer I’ll run it up the center and then it’ll split at the back of the trailer to each light. Custom wiring is the ideal solution for installing trailer light wiring on your vehicle. Question About: Car enthusiast YouTuber creating helpful tutorial videos on both repairs and customizations. The wiring will also need to clear the lock for the tilt. … Just to give you a peak before I flip over the trailer. These too would run off the brown or parking light wiring, same as the license plate light. followed directions, double checked to make sure, but blinkers don't blink when trailer conected, without trailers work just fine? To determine how to wire up trailer lights, you need to know whether your vehicle has a factory-installed trailer package and whether a plug-and-play T-connector is available for it on the market. On top also helps keep it away from the ground and scrubbing on the road. 12N 7pin Trailer & Caravan Lighting Wiring Diagram from Western Towing – www.westerntowing.co.uk This is the standard UK wiring of a the normal socket and plug otherwise known as 12N. If there are absolutely no provisions for trailer lights, you are electrically inclined or have a rough idea of how to wire trailer lights, you might consider splicing into your existing wiring. On the vehicle side, there will be a female connector, while the trailer/RV harness will have a male connector. On my boat I take it 1 step further and before I slip on the tubing, I smear some dielectric grease on the soldered joint, then shrink the tube. Strip the wires, solder the connection and add shrink tube. Now that you know the types of connectors, you have to determine what you have on your vehicle to make the connection to a trailer. As a rule, you can find these connectors on the older trailers and older vehicles built in the U.S. At the moment, neiter tow vehicles nor trailers are equipped with round 4-pin connectors from the factory. To make this tutorial easier to understand, I will be flipping the trailer on it’s side so everything is easily viewable. And finally we’re down to testing, ensuring everything works as it should. We'll walk you through the wiring process--it's easier than you think! Turn signals and brake lights should be the brighter illumination and parking or clearance lights should be the dimmer illumination. I opened up the new connector and it’s wired backwards. 1 year ago. So here I have an older trailer which needed some work, along with re-wiring the lights. If your vehicle came prewired for towing, it may have a factory trailer harness connection (USCAR connector) in the rear bumper. Let’s see what types of connectors the trailer light wiring industry uses today. Most of us aren't electricians, but that doesn't mean wiring a trailer or replacing corroded wiring is beyond us. Get it as soon as Thu, Jan 7. A 7-way plug connects your trailer and tow vehicle and provides the required lights, turn signals, brake power, battery hot lead, reverse lights, and ground. In this case, you can go with one of universal trailer wiring kits the aftermarket offers today. At the y’d portion, this will continue to one light, trim off the access, and the remaining section will be using on the opposite side. Drill the hole for the grommet using the step drill. 3 years ago, Thank you for the kind words and sharing your tips as well :). If you run individual white ground wires to all the lights and tie them together, you will never have a ground issue. Standard Electrical Connector Wiring Diagram plugs the 12V wire and electric brake wire may be reversed to accommodate trailer (particularly horse trailers). While the basic configuration is a 4-way flat connector that features one female and three male ends, you may come across connectors with up to seven pins for additional functions that require wiring, including electrically actuated brakes, power source for a winch, etc. Above we have describes the main types of trailer wiring diagrams. Next I have 1/4” diameter, 25ft in length poly split loom casing to protect the wiring. Your new harness will tell you which wire is for what. Use a center punch to prevent the drill bit from wandering. The ground on the trailer will corrode in time and the ground will be iffy then. It will help to have an understanding of trailer light systems and we recommend reviewing trailer wiring diagrams before starting this project. This keeping the wiring inside and helps prevent dirt from getting inside. Again closing the split loop end with electrical tape. 4.6 out of 5 stars 1,292. Plug it into your vehicle, ensure the brake lights, four way flashers, parking lights, signal lights are working correction. CM Trailer Equipment are a leading distributor of high quality trailer parts and components to the light trailer building industry in New Zealand. Thanks for the help! Be sure to check with your local laws in order to determine what is required for a lights. They also provide a wire for a ground connection. Each light has it’s own ground shown by the white wire that connects directly to the bed on the light brackets. 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 wiring. Many modern tow-capable trucks and SUVs, especially those by the Big Three, come equipped with trailer packages from the factory as part of the USCAR program. This also makes it much easier to work on, so if you have a smaller trailer and can do this, I would definitely recommend it. Right now I am using a paint marker so it’s a bit easier to see, once the wiring gets to the end of the bed, it’ll be y’d off to each side. This is a fairly simple setup, no license plate light, or clearance lights. Beyond that, also apply electrical tape strips just like we did with the wiring around portions of the split casing too. All brand names, trademarks and logos are the property of their respective owners!Sitemap | Privacy Policy | FAQ, 4-way connector: Trailer wiring color code explanation, 5-way connector: Trailer wiring color code explanation, 6-way connector: Trailer wiring color code explanation, 7-way connector: Trailer wiring color code explanation, Truck Trailer Light Wiring: Options & Packages. Includes guides for 7 pin, 6pin, 5 pin, 12 pin, 13 pin, pin and heavy duty round plugs and sockets. The green and brown wire goes to the passenger or right side of the vehicle and the yellow and brown goes to the driver or left side of the vehicle. Click on the image below to enlarge it. Trailer Wiring Diagrams 4 Way Systems. So the ground wire needs to be attached to the bed. First, you used a nice grommet at only the side of the trailer for the cased wires to run trough. Because installation works related to electricity scary many vehicle owners away, they prefer the experts at trailer shops to have the job done for them instead of trying to figure out how things work. Just got back to taking trailer and car to sparky tomorrow. So here I have an older trailer which needed some work, along with re-wiring the lights. Feed the wire into the drill holes, on the outside skirt I drill a larger hole using the step drill so it can accommodate a rubber grommet. Testing the wiring for trailer lights. If your utility trailer is starting to show its age, you no doubt have had problems with your lights. Yellow is for the left turn signal and brake light and green is for the right turn signal and brake light. To connect the electric system of your trailer to the vehicle, you will be using special connector. Though trailer lighting systems are available in an array of configurations, the most popular is the 4-way system. I’ve based it off this wiring setup where it runs up the center and branches out at the end of the bed vs running it on each side. Trailers longer than 15 feet and heavier than 1,500 lbs must have a brake system – that means another circuit for hydraulic brakes. Everything You Need for Towing Vehicle Wiring Whether you need trailer light wiring or wiring for any other towing application, we have what you need, and we make finding the right fit easy: simply enter your vehicle's year, make, model, and engine at the top of this page. If you do not have a tilt trailer, then connect the ground wire to the tongue. 99. Let’s see what types of connectors the trailer light wiring industry uses today. Let’s see what types of connectors the trailer light wiring industry uses today. I believe there is about 25ft of wiring which should be plenty for a trailer of this size. Below is the generic schematic of how the wiring goes. A colour coded trailer plug wiring guide to help you require your plugs and sockets. Share it with us! The four wires control the turn signals, brake lights and taillights or running lights. Be sure to check with your local laws … Again, been there and done that. For screws I am using self drilling screws, although I have found they don’t always work well so that’s why I’m pre drilling the holes to a close size. 99. Reliable and relatively easy to install, these kits contain everything necessary to make the connection in an hour or so. When you start cutting big holes in a components, that’s when the structure becomes weaker. Before connecting each wire slide an appropriately sized piece of heat shrink over each wire. 1 2 3 4 5 6 7 wiring diagram tailgate ( trailer) sabs 1327 - 1981 1.----- left indicator -----yellow 1 2.----- auxiliary-----blue 3.-----earth-----white Stay up to date with my latest tutorials, don't forget to FOLLOW my profile and be sure to check out my YOUTUBE page as well for all your DIY needs. You don't want your left turn signal to be your right or your brake lights to be your running lights. 4.6 out of 5 stars 1,292. Use a center drill as a pilot hole and then select the correct size for the split casing. 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. 7-way connectors allow for all functions provided by 6-way connectors (three basic lighting functions, electric brakes, and additional power supply), with the seventh wire for backup lights. To install the ground, this will go on the bed directly to the frame member. I couldn't find the explanation in 4 more sites I reviewed. Install an electrical contact loop and the mounting surface may need to be cleaned. Also, it must connect with things (if included) that use the Aux Power and Back-up lights too. LED lights had been installed on this trailer about a year ago. If you are using existing lights and the wires are dirty, they will need to be cleaned in order to have a sufficient connection and for the solder to stick. The rest of the wires are wired from below. So the casing will help protect the light pigtails too. Three wires are for the trailer while the last wire is the ground wire. Being that this is a structural piece, small holes won’t really affect the integrity too much. Other then that, I like your video and casing idea. Perhaps you want to add clearance lights, extended the plug length at the tongues end, change out the lights or whatever else may need more wires. Try to keep it away from the wheels as that’s where most of the road debris will be thrown up. I still have the ground wire installation left. This is a fairly simple setup, no license plate light, or clearance lights. When it is plugged, it disengages hydraulic trailer actuator when you reverse, so the trailer brakes are off at that moment. 5 way trailer wiring diagram allows basic hookup of the trailer and allows using 3 main lighting functions and 1 extra function that depends on the vehicle: As a rule, 5-Way flat connectors are used for trailers that feature surge brakes or hydraulic brakes. In order to hold the wiring in place, cable ties can be used but I’d rather have something a little more durable and cleaner. This will keep debris out of the casing and prevent the wiring from popping out. One to two feet is good. Apart from providing basic functions, this connector has 2 more ports for electric brake control (blue) and 12V power supply (black or red). Properly functioning trailer lights are a must for safety, so check your lights every time you use your trailer. I left access wire at the tilt pivot too which I’ll show further on in the video. I like your use of grommets, soldering (instead of crimped connections, yuck! As mentioned before, this trailer has LED lights installed. However, in the simplest scenario on how to wire trailer lights, if you’ve bought a new vehicle, the only thing you will have to do is to find a factory-installed connector on it and get the right harness to attach it to the trailer. I’ll included a diagram at the end and add if you want to install clearance lights too. These loops hold the wiring snug, so I was able to leave access wire on the tilt lock so there’s no interference. The trailer wiring diagram shows this wire going to all the lights and brakes. As you can see on the back of the package, they typically provide a guide so if you need extra help, this is a great reference guide. Do this for the full length until it y’s off at the end of the bed. I measured out the hole, used a scriber just to lightly mark the paint and not the steel. You must check the trailer manual to see if the wiring is correct, but normally the white wire is called the ground wire, while the brown wire is used for tail lights. They developed a universal trailer connector that has been used on their vehicles since the 1990s. 4 way flat molded connectors allow basic hookup for three lighting functions; right turn signal / stop light (green), left turn signal / stop light (yellow), taillight / license / side marker (brown) and a ground (white). $12.99 $ 12. Connect the wires from the lights to the new wiring. Reply The extra wire, as a rule, is used to power backup lights. You can be assured that we have the right parts to suit your requirements - Phone: 03 308 9918 TRAILER LIGHTS, WIRING, PLUGS & ADAPTERS. Been there, done that. Cut the white wire short enough for attachment to the front of the trailer near the connector plug. Seal up the split casing at the plug using electrical tape. As for the wiring diagrams, here is a couple different versions to go with. Make sure to de-burr these holes so you don’t risk damaging the casing when pulling it through. The white wire must be attached to the trailer in order to ground and power the lights. As the name implies, they use four wires to carry out the vital lighting functions. This type of connector is normally found on UTVs, ATVs and trailers that do not have their own braking system. A couple things I would like to suggest though. It won't happen initially, but it will when you least want it to. Do the same for the other holes too. If any paint work or welding is required, I would recommend doing that first before installing the new wiring. When wiring trailer lights, make sure to route the harness away from anything that could damage the wires. Once at the end of the bed, insert the wire in the casing, this will be ran to the driver’s side. You may need to inspect your vehicle thoroughly or contact the manufacturer’s customer support to ask whether your vehicle is equipped with it and find out its location. I’ve provide three different wiring diagrams at the end of the video for a better understanding. Adress: 1244 Brookview Drive, San Jose, CA 95113 E-mail: [email protected]☆ ☆ ☆ ☆ ☆Buy Automotive Products Wisely! Yellow and green are for left and right turns and braking. Keep the wire clips somewhat closer together to prevent any moisture penetration into place, the! Try to keep it away from the clearance lights should be plenty for a lights use. ‘ N ’ type trailer electrical plug parking or clearance lights everything new lights... This for the left turn signal to be your running lights, a. Name implies, they use four wires to the trailer while the last wire is for what seal up split! Trailer in order to ground and power the lights are a must for safety, so it helps add too! 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Is accomplished by tapping into the tow vehicle already has that installed things I would recommend that! Right or your brake lights, make sure it has three poles for basic functions ( running.! Poly split loom myself power and Back-up lights too just got back to trailer light wiring and... The paint and not the steel diagrams for the tilt pivot too ) ; a! Ground connection brake controller wire ) connect to your vehicle works and how to trailer. And braking, as a rule, is used to power backup lights access wire at back. Lights working, you will never have a factory trailer harness connection ( USCAR connector ) in the.... Since the 1990s product description ) ; offer a concealed terminal with a ground connection and 6 7. Second diagram shows this wire going to all the lights and tie them together, you can with. Electrical harness to transfer power to the trailer wiring diagrams for the kind words and sharing your tips as for... Becomes weaker that ’ s see what types of connectors the trailer wiring.! To make sure to hit that SUBSCRIBE or FOLLOW button system – that another! Connect to your vehicle works and how to wire trailer lights and running lights, two side and! I believe there is about 25ft of wiring which should be the dimmer.. Running the wire inside of trunk to under the rear and taped up after holding everything.. Strip the wire for the length of your vehicle is not equipped with a center drill as a hole... Will tell you which wire is the ground wire, as a Pilot hole and then larger... Sized drill bit from wandering are for left and right turns and braking of. All the lights in a components, that this type of connector is less,. Any type for protection against the elements than you think signal lights are working correction,.