Fransonic Trailer Wiring Harness

More than 27 years’ experience Trailer wiring harness factory from China

Get Our Best Quotation
Quick Quote

How to install wiring harness for trailer

The application of trailers is becoming more and more widespread today. Now let’s introduce how to install the trailer harness

The trailer harness is divided into two parts. The interface on the tractor is called the female connector, and the harness interface on the RV or trailer is called the male connector. Common trailer harnesses are divided into 4-pin, 7-pin and 13-pin types. Among them, the 4-pin harness interface is a motorcycle trailer interface. The male harness only has four wires: left turn signal, right turn signal, tail light, and ground wire, while the female harness has brakes, left turn signal, right turn signal, tail light, Five ground wires are connected. The 4-pin wiring harness is mainly prepared for motorcycle trailers and has little to do with RVs, so I won’t give a detailed explanation here.

The 7-pin wiring harness and the 13-pin wiring harness are specially prepared for towing RVs. The installation of the 13-pin wiring harness is easier than the 7-pin wiring harness, so let’s talk about the connection method of the 13-pin wiring harness first.

The 13-pin wiring harness is also called the European wiring harness interface because it is commonly used in European trailers. The interface of the 13-pin wiring harness includes brake lights, left and right turn signals, running lights, reversing lights, fog lights, long fire wires, ground wires, etc. It is worth noting that although there are brake lights in the wiring harness, there is no brake. Most European trailers use impact brakes, so there is no need to connect brake lines.

Many European imported vehicles (such as: Volkswagen Magotan Business Travel Edition) will have this 13-pin female harness. Although some vehicles do not have a 13-pin female harness, they have reserved interfaces. Like the “Land Rover Discovery 4” is in the left taillight. When you have the original 13-pin female header, you can use it directly. It is also easier to have reserved interfaces like Land Rover Discovery 4, and there will be optional accessories from the original factory that can be installed.

However, more vehicles do not have these interfaces, and additional wiring is required. Generally, the scheme of routing wires from the rear taillights is adopted. In this scheme, attention should be paid to the bearing capacity of the original car wires and the safety of construction. If the original car has a female 7-pin harness, you can also consider using a harness converter to convert the 7-pin to a 13-pin harness.

7-pin wiring harness, also known as American trailer wiring harness, these 7 wiring harnesses are brake lights, running lights, left and right steering, long live wires, ground wires and spare wires. Pickup trucks such as the Raptor F150 and Tundra all have original 7-pin wiring harness females, but note that the original wiring harnesses of these cars may not match the wiring harnesses of the RV. The original car like the Raptor F150 does not distinguish between the brake light and the turn signal signal, and the brake signal needs to be connected according to the actual situation. The dealer of the RV will provide the drawing of the wiring harness for the specific connection method, and it can be debugged according to the drawing.

Another important point is that the braking mechanism of American trailers is different from that of European trailers. Most of them use electric conduction drum brakes. Without ABS, the brakes lock up easily at low speeds. At this time, another piece of equipment needs to be installed-the brake controller.

The installation and use of the brake controller are very simple, with four positive and negative wires, brake signal input, and brake signal output. There are two solutions for American vehicles that do not have a separate brake signal. 1. Use a decoder to reduce the brake signal and separate it from the original signal. 2. There will be a separate brake signal source at the position of the pedal, from which the separate signal of the brake is drawn. This separate brake signal is then introduced into the brake controller. It should be noted that there is a gyroscope inside the brake controller, so the brake controller needs to be fixed horizontally in the car. When in use, the low-speed brake sensitivity is lowered, and the high-speed brake sensitivity can be adjusted appropriately.

RVs don’t get a lot of day-to-day use, and most of them are outdoors, so check your RV’s lights and brakes every time you hook up your tow vehicle to your RV. Don’t panic when there is a problem, most of them are just poor contact, just squeeze it with pliers. The seemingly simple trailer wiring harness installation is not simple in actual operation. Therefore, it is not recommended to install the trailer wiring harness and brake controller by yourself. It is best to find an experienced car modification shop to do it. After all, sharpening a knife does not cut and dismantle by mistake, and safety comes first.

Read More

Different Pins trailer wiring harness

For the trailer wiring harness,we have 2 pole flat connector,4 pin trailer wiring extension,7 core trailer wire and so on.

We can do OEM for customers,about cable length,size.

Trailer wire colors 4 pin,trailer lights wire

5-Pin Flat Plug Trailer Light Extension Wire Harness Connector Famale/Male

6 pin trailer wiring

These vehicle-trailer connectors make great replacement 6-way square wiring connectors for your vehicle and trailer

7 core trailer wire

7-way trailer Plug Weatherproof Wiring Junction Box,This trailer wire provides a fast, simple way to connect the wires from the trailer cord to the trailer wiring.

13 pin trailer wiring

13pin Euro trailer plug,is used for supplying all trailer or caravan lighting including reverse and gives auxiliary power to other systems such as fridges, internal lights and charging systems.

6 Products Found.

Our advantage

Advanced equipment
Since year 1995

Our factory has more than 27 years’ experience and ISO 9001:2015 certificated.

one-stop service
Abundant market experience

Our customers are all over the world,North America,South America,Europe and so on

Quality control
Strict quality control

We have QC department,make sure 100% good quality.

24 Hours Customer Service

24 hours Customer service

Strict Quality Control process

For every item,we have a series inspection to make sure the quality of the trailer wiring harness.

The main inspection items of automobile wire harness are:
Electrical properties: rated voltage, rated current, temperature rise, contact resistance, insulation resistance, dielectric strength, current cycle resistance and other indicators.
Mechanical properties: insertion force, pull-out force, terminal holding force, hooking strength, unlocking force, mechanical shock resistance and other indicators.
Environmental performance: air tightness, water resistance, salt spray resistance, heat aging resistance, oil resistance, etc.

Quality is factory’s life.You are safe if do business with us.

More than 27 years Trailer wiring harness manufacturer From China

Our workshop

  • Met my expectations 110%. actually used connectors for 3 phase Alternate Current connection and they out surpassed my expectations. connectors dont even looked bothered. very happy. would recommend to friends and family.

    Michael from United States
  • Excellent experience with this vendor. The products came out individually packaged and of high quality. They had a very competitive price.

    Kenny Chen from United States
  • Communication was excellent, easy to understand and very willing to assist, thank you very much

    Kim from South Korea

Frequently Asked Questions

Where is your factory?

We are in Hangzhou City,Zhejiang province,which is near Shanghai and Ningbo port,so shipment is very convenient.

How we can order?

You can send enquiry to us,tell us product details,demand quantity,your package requirement,then we can check cost for you,OEM is also welcomed.

What payment way do you accept?

We accept TT (wire transfer),Paypal,west union,alibaba trade assurance,LC.

What is the MOQ of your product?

For the connectors,normally MOQ is low,1oopcs is acceptable.For wiring harness,due to many material,so if no stock material,MOQ is 1000pcs per model.

What is the lead time?

Normally for the connectors we have stock,for wire harness,lead time is around 25-30 days after payment is received.

Send Your Inquiry Today
Quick Quote
Scroll to Top