The trailer wiring diagrams listed below, should help identify any wiring issues you may have with your trailer. Install a memory saver and disconnect the battery. Therefore, you conclude, the trailer is good. It is usually used for towing a heavy-duty , car trailer, boat trailer, horse trailer, travel trailer, , and larger trailers. Attach all of the wires to 7-wire plug. Hold the plug so that you are looking at it from the rear with the hinge for the front access door on top.
Attach the blue wire that came with your 7-wire plug to this blue wire. Connect to the right-turn signal and the running lights. At a bare minimum, the last several feet of corroded wire should be replaced. Once this is verified, go to the connection at the tow vehicle and test there. To relieve any strain on the ground wire, splice in a short length of additional wire and use a cable clamp to secure the whole wire bundle to the trailer tongue. Connect the ground cable to the negative battery terminal, then tighten it.
Here are some thoughts about trailer wiring that might help when the boat is spending too much time in the garage waiting for you to get a couple of light bulbs working. If the bulbs are not the problem, disconnect the trailer's wiring system from the tow vehicle. Slide the eyelet for the white wire onto the bolt along with the stock ground wires, and then install the bolt. Look for water trapped inside the light fixtures. The test light should come on.
Also, when things start really appearing strange, start checking ground connections. If in doubt, redo the connection. This thread is more than 90 days old. If you've got bright, well functioning brake lights on the trailer, these lights will catch the attention of the drivers behind you, regardless of how much they are paying attention. The problem with crimp-only terminals is they tend to have a weak connection even though they might feel quite tight. If the tester illuminates when it should not example: a phantom turn signal illuminating , it is a sign there might be a short in the tow vehicle wiring.
I prefer to use a bulb with two test leads wires attached to it. Apply the liquid tape to the joint. Keep in mind, these devices can fail, they have diode logic circuits inside of them. Under normal situations, current hole current flows from the positive terminal of the battery, through the wire to the filament, through the filament, through the base, through the ground, through the vehicle frame back to the battery negative terminal. If you find a place where the wire bundle appears to be too big, then you have probably located the pig-tail.
Slide the white wire between the lower-right plate and terminal, then tighten it. Locate this wire where it comes out of the interior fuse box. Remove the two mounting screws, then pull the taillight away from its hole in the left bed panel. The female pins carry the voltages for the different lights, the male pin is the ground or return for all the circuits. Begin by cleaning the ground connections. Okay, you get the picture.
Some are universal ones that connect directly to the wires; others are designed for specific vehicles and plug into the wire harness at certain points. Once the liquid tape dries, apply a second coat of tape to completely seal the wire joint. You change the right rear bulb, and the problem goes away. They also have one wire for trailer brakes and one wire for a battery connection. If your brake lights work, or your marker lights work, but nothing works when you turn on both at the same time, your trailer is not grounded to the truck. Engineered to Deliver We design, engineer, and build our own I-Beams.
Model T Ford Forum: Forum 2012 Started January 1, 2012. Once the liquid tape is dry, zip-strip the wires to the existing wiring harness, and then feed them through the hole in the left panel of the bed. Plug in the tester to the socket. Okay, it can't go out the ground because the ground is bad. Some vehicles, especially the ones with factory installed tow packages, have a trailer pig-tail wrapped up in the tail light wire bundle.
Allow the wires to rest on the ground for now. However, when something goes wrong, this simple wiring can become very complex and confusing. Trailers with electric brakes need them too. This is accomplished by tapping into the tow vehicle's electrical harness to transfer power to the trailer wiring system. While none of these are things we look forward to when pulling a trailer, they are also easy to correct. Use wire trimmers to reveal about 1 inch of copper wiring. They supply power to the taillights, turn signals, brake lights, , reverse lights, auxiliary power and include a ground connection.