The additional wire is tapped into the backup lights to disengage the trailer's brakes when the vehicle is reversing. This may also be used for trailers with surge brakes. This connector has become very popular with RV'ers who tow a vehicle behind their motorhome and want to add a coach signal line from the braking system in the towed vehicle. The 5 pin round connector allows for the basic functions, as well as a pin to provide support for another function. This type of connector allows for the basic connection of the three lighting functions which include running, turn, and brake lights along with a ground pin and electric brake connection. You will find this style connector on utility trailers and campers that require brakes and is generally considered a temporary setup due to it's ability to become easily disconnected or corroded. It also comes with one pin for ground wiring. This type of connector allows for the basic connection of the three lighting functions which include running, turn, and brake lights. If your looking at the 4 pin coiled cables they will all be the standard 20 amp version. This will not mate with the standard 20 amp version that has 4 pins of the same size. Be careful with the 4 way connector, there is a version considered heavy duty with a 35 amp rating that feature a larger ground pin. This is a great replacement for the 4 way flat connector since it provides a secure connection between the receptacle lid and plug tab. You will find this style connector on small utility trailers and campers that do not require brakes as well as basic towed vehicle wiring kits. It is important to know what type of connector you need and we are here to help. If you have a connector that is located under the vehicle you might want to connect it to the vehicle by using a mounting bracket to help prevent damage from a angling wire. You need to make sure that you choose a connector with the appropriate number of pins for the required functions of your trailer or towed vehicle. Trailer or towed vehicle wiring can be confusing with all of the different purposes for connectors that you might not be aware of. Trailer wiring and choosing the right one for your application. Protect your RV and your family while on the road: Join Good Sam RV Emergency Road Service Today and save!ĭon't Forget To Visit The Everything About RVing Stores.With all the different shapes and sizes of connectors it's not always easy when it comes to ĭo you have any suggestions or comments on this topic? You can add them to this page by clicking on the "Click Here To Post Comments" link located near the bottom of this page. It should be quite helpful to you if you actually have to install some trailer connectors. To get some great information on properly wiring your Travel Trailer and tow vehicle you should visit 's Trailer Wiring Diagrams Page. Leave your RV repair bills to us-Good Sam Extended Service Plan Not all trailer or tow vehicles wiring is color coded in a standard way so you may need to use a 12 Volt Circuit Tester to trace the wiring. When replacing the connectors the main problem is determining which wire goes to what. You may have to replace them to get the lights working properly. The fact that when you shake the connections they will work could mean that the plug on your tow vehicle or your Travel Trailer is not making proper connections. Follow that wire to the ground on your trailer and make sure that the ground is tight clean and is attached to clean bare metal. Normally the ground wire will be a white wire. The first thing you should check is the ground on your Travel Trailer. Yes a loose ground can cause the problems that you are experiencing with your trailer lights. I have tail lights, but not turn signals nor brakes.Ĭould it be that the ground is loose where it connects to my trailer? Where do the various wires connect to my trailer? I have a 1989 Holiday Rambler Alumalite 32 travel trailer.ĪNSWER: Greetings Carl thanks for submitting your question on our Ask An RV Question Page. In the past, after sanding the connections and "jiggling" the connection, it would work. When I connect the 7 pin connection to my tow vehicle, sometimes one of the turn signal will not work, and sometimes the brakes will not work.
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