1、MAIN PURPOSE: 7 way 8 feet trailer wiring harness, with junction box, mainly used to signal electric lights to campers and trailers to ensure safe travel. 2、WEATHER RESISTANCE: This wire harness has good weather resistance in 40℉ (105℃) dry and 15℉ (60℃) wet conditions, is safe and environmentally friendly. 3、APPLICABLE VEHICLES: This 7 way wiring harness is perfect for RVs, trailers, campers, schooners, trucks, dining cars and other tractors, with good practicality. 4、EASY IDENTIFICATION: Each connector has identifiable markings and different colors for safe and easy installation of RV and tow hook, avoiding wiring errors. 5、CONNECTION METHOD: For connecting ground wire (white), 12V charging wire (black), backup light (yellow), left parking light and turn signal (red), right parking light and turn signal (brown), tail light (green) and brake light (blue).