Final answer:
The green wire is used for the right turn signal circuit on a trailer 7-way power connector, following standard color coding conventions for trailer wiring.
Step-by-step explanation:
The wire color code for the right turn signal circuit on a trailer 7-way power connector is typically green.
Trailer wiring connectors follow a standard color code where each color represents a specific function for the ease of wiring and troubleshooting.
In the case of a 7-way connector, which is often used for larger trailers with electric brakes and auxiliary power, the green wire is designated for the right turn signal and right brake light.