Beginners Guide to RV Wiring


Wiring the 4 pole utility trailer plug
4 pole wiring diagram

Pin locations for the flat four pole plug

The four pole plug is a simple connection for a boat or utility trailer and is used for lighting only. It is a flat connection with four wires.

4 pole RV plug
Terminal Wire Color Function Location - Truck Location Trailer
1 White Ground uncovered pin covered pin
2 Brown Running Lights 1st covered pin 1st uncovered pin
3 Yellow Left turn/brake light 2nd covered pin 2nd uncovered pin
4 Green Right turn/brake light 3rd covered pin 3rd uncovered pin