The standard color codes used in travel trailer wiring are as follows:
- White: Ground
- Black: 12-volt power (typically connected to the battery)
- Blue: Electric brake controller (optional)
- Red: Left turn signal
- Green: Right turn signal
- Brown: Taillight
- Yellow: Reverse light (optional)
Please note that these color codes may vary depending on the manufacturer of the trailer. It is always a good idea to refer to the owner's manual or wiring diagram specific to your trailer to confirm the color code before making any electrical connections.