Trailer electrics for passenger cars
Electrical connection
The trailer’s electrical wiring must be securely connected to the vehicle’s electrical system using a standard 7-pin connector. This connector provides the transmission of lighting, braking and turn signal signals.
Electrical system composition
The trailer electrical system consists of the following components:
* Wiring: Copper wiring connecting system components.
* Tail Light: Provides tail lights, brake lights and turn signals.
* Side Marker Lights: Located on the front and rear of the trailer, indicating its size.
*License Plate Lights: Illuminates the license plate.
* Fog lights: Provide additional illumination in poor visibility conditions.
* Reflectors: Bring light back to the source, increasing visibility.
Connector types
There are several types of trailer connectors:
* 13-pin connector: The most common type, providing 12V power for refrigerators and other devices.
*7-pin connector: Standard connector providing 12V power for basic lighting functions.
*5-pin connector: Older version of the 7-pin connector that does not provide 12V power.
Connector pinout
The colors and pin locations of the connectors may vary depending on the type of connector. Here is the general connection diagram:
13-pin connector
*Pin 1: Left turn signal
* Pin 2: Right side light
*Pin 3: Ground
*Pin 4: Right brake light
*Pin 5: Reverse ground
*Pin 6: Left brake light
*Pin 7: Power supply for refrigerator
*Pin 8: Left parking light
*Pin 9: Power 12V
*Pin 10: Ground
*Pin 11: Left fog light
*Pin 12: Right fog light
* Pin 13: Ground
7-pin connector
*Pin 1: Left turn signal
* Pin 2: Right side light
*Pin 3: Ground
*Pin 4: Right brake light
*Pin 5: Left brake light
*Pin 6: Left parking light
*Pin 7: Right fog light
5-pin connector
*Pin 1: Left turn signal
*Pin 2: Ground
*Pin 3: Right brake light/parking light
*Pin 4: Left brake light/parking light
*Pin 5: Ground
Electrical installation
It is important to install the trailer electrical system correctly. This includes:
* Laying the wiring in such a way that it is not damaged.
* Use sealant to protect connections and prevent moisture ingress.
* Test the system before use to ensure proper operation.
Safety Tips
* Check your trailer’s electrical system regularly to ensure there is no damage or corrosion.
* Keep all electrical connections clean and dry.
* Avoid overloading the trailer’s electrical system.
*If you are unsure about installing or servicing your trailer’s electrical system, please contact a qualified electrician for assistance.