Attach the yellow wire to the wire for the left-turn and brake light. The trailer wiring diagrams listed below, should help identify any wiring issues you may have with your trailer. Trim about an inch off the insulation of the new wire. Wiring a 7-pin plug on your truck can be a little intimidating when you are looking at it from outside the box. However, I use an adapter for flat to round when my trailer gets loaned out to a car with round socket. Download this guide, print it and keep it in your toolbox for future reference. After blowing 3 fuses decided to limp back home to sort it later.
Locate the rubber grommet that surrounds the interior wiring harness where it feeds through the firewall. This supplies power to the road lighting of your trailer or caravan. By law, trailer lighting must be connected into the tow vehicle's wiring system to provide trailer running lights, turn signals and brake lights. That is the green stuff that forms when oxygen from the air or water come in contact with copper. Bought two narva 7 pin connectors to wire up to the trailer and a bike carrier.
The other has round pins. We are going to do our best to simplify that, mainly with a good, color coded diagram. And in my personal experience the flat is more reliable. I think part of it is that the flat connector has the female part the part you need to protect most covered and attached to the vehicle, whereas the 7 pin round connector has the female socket as the plug on the trailer. Jun 09 2011 Filed In: , The is still the most common connector for towing.
If you like the design on our website, please do not hesitate to visit again and get inspiration about Wiring Diagram in our website. The below diagrams are for reference. Drop the tailgate and find the mounting screws for the left taillight. I used a small 7 pin round for 10 years, and then after replacing the plug multiple times changed to 7 pin flat for the last 12 years, and I have never had a problem with a flat connector. Click on the image below to enlarge it.
You can use a circuit tester to verify connections. All diagrams are as viewed from the Cable Side 12 Pin Flat This is an extension of the 7 pin flat. This is accomplished by tapping into the tow vehicle's electrical harness to transfer power to the trailer wiring system. So, if you step on the brakes and all the trailer lights go out, then you need to ground your trailer to your truck with the ground wire. Other wiring diagrams on this site are listed below: To purchase components for trailer wiring please visit —. Ensure that you cover all bare wiring.
Twist the new wire around the strands of the existing wire. There are two types of 7-way connectors. Allow them to rest on the ground for now. Connect to the left-turn signal and reverse lights. Trailer electrical connectors come in a variety of shapes and sizes. Hold the new wire parallel to the existing wire so that the exposed strands of each wire are next to each other.
Trim and connect a new wire to the existing wire. Having the wires backwards will cause problems. Find the blue wire that comes off of your electronic brake controller. It is usually used for towing a heavy-duty , car trailer, boat trailer, horse trailer, travel trailer, , and larger trailers. Disconnect the wiring from the taillight and set the taillight assembly aside. Connect the black wire for your 7-wire plug to this wire. Attach the black wire to the upper-left terminal.
So if you have the choice, go flat! Remove the soldering iron from the wire joint. Also sometimes the small 7 pin round is rotated so that yellow is on top. Once the liquid tape dries, apply a second coat of tape to completely seal the wire joint. Attach the blue wire that came with your 7-wire plug to this blue wire. Wait for the solder to melt and wick through the wire strands. If you are local to us, give us a call if you want to schedule a time to have your trailer fixed. Notice: All prices on this website are subject to change without notice.
Isolate the negative cable from the negative battery cable. Various styles of connectors are available with four to seven pins to allow transfer of power for the lighting as well as auxiliary functions such as , backup lights etc. Determine which color wire supplies constant power to the ignition switch. To properly make the connection use the following steps: Trim back the insulation on the existing wire. Not sure which is your case — if the indicators are swapped it sounds like the large plug. Found the bike carrier had its wires soldered to clips so decided not to play with it for now and just tested it with an adaptor I had from round to flat. Remove the two mounting screws, then pull the taillight away from its hole in the left bed panel.