Electrical system diagram for a car trailer
1. Trailer connection diagram
*Power Wiring: From the vehicle battery through the trailer fuse and relay to the trailer connector.
* Grounding: From the trailer chassis to the vehicle chassis.
* Turn Signals: From the vehicle’s turn signal switch via the trailer relay to the trailer’s turn signals.
* Brake Lights: From the vehicle brake pedal through the trailer relay to the trailer brake lights.
* Side lights: From the vehicle side light switch to the trailer side lights.
2. Trailer electrical components
*Trailer Connector: Contains contacts for all electrical connections between the vehicle and trailer.
*Trailer Fuse Box: Protects the trailer’s electrical system from overloads.
*Trailer Relay: Controls the flow of electrical power to trailer components.
* Turn Signal Flashers: Converts the vehicle’s flashing signal into sequential flashing of the trailer’s turn signals.
*Trailer Brake Light Relay: Switches the trailer brake lights when the vehicle brake pedal is pressed.
*Trailer side light switch: Turns on the trailer side lights when the vehicle side lights are turned on.
3. Trailer connection features
*Trailer Connector Types:
* 4-pin connector: turn signals, brake lights, parking lights.
* 5-pin connector: additional brake lights.
* 7-pin connector: additional reversing lights, fog lights.
* Color coding of wires:
*Brown: ground
*Yellow: Left turn signal
*Green: Right turn signal
*Red: brake lights
*White: side lights
* Installation and maintenance:
* Cables must be securely fastened and protected from damage.
* Check electrical connections regularly for corrosion or damage.
*Only use parts designed for the trailer’s electrical system.