Wiring
* Use wires with sufficient cross-section for rated load
*Solid wire, not stranded wire
* Wires must be protected from abrasion and damage
*Use of UV and water resistant electrical tape
Lights
* Side lights: red rear, white front
* Direction indicators: yellow
* Brake lights: red
* Reversing light: white
Socket and plug
*standard 7-pin socket on vehicle
*Matching 7-pin plug on trailer
*Contacts must be clean and free of corrosion
Grounding
*Trailer must be grounded for safety
* Connecting the ground wire from the trailer frame to the car body
Fuses and relays
*Use appropriate fuses and relays to protect the circuit
* Location of fuses and relays in an easily accessible place
Wiring diagram
*Create a clear wiring diagram for easy diagnostics and maintenance
System check
* Checking the operation of all lights and turn signals
* Checking for grounding
Additional equipment
* Connectors for connecting additional devices such as trailer brakes or a refrigerator
*Trailer battery charger
* LED lights for better visibility and energy efficiency
Safety Tips
* Disconnect power before working on electrical wiring.
*Use reliable connectors and electrical tape
* Check the system regularly and repair if necessary
*Follow all local rules and regulations regarding trailer wiring