DOUBLE PRONG TRAILER PLUG: Cheemuii 7 pin trailer plug uses the premium copper double prong to replace the poor single prong, and the outer wrap is made of weatherproof and durable material to ensure a longer service life JUNCTION BOX: The junction box is equipped with 7 color-coded terminals and wires, which can easily identify the corresponding functions of the wires and facilitate wiring. Strong junction boxes are waterproof and dust resistant to increase the service life of trailer cords COPPER POWER CORD: The 7 way trailer wire is made of high-quality copper and has a long service life. And has excellent electrical and thermal conductivity, to ensure the normal use of car lights in the process of driving (such as turn signal and brake lights, etc.) DETAILED WIRING INSTRUCTION: CheeMuii trailer cords use 7 color-coded wires, and the color code adopted is suitable for most RV trailer wiring standards, but as there are some differences between trailer manufacturers, we have updated the detailed instructions, please read them carefully before use. Please refer to the wiring instructions and connect cables according to the color and function of the wires to avoid errors WIDE APPLICATION: Suitable for trailers, RVs, campers, caravans, food vans and other towed vehicles. Perfectly connected taillights, brake lights, reverse lights, turn signals and auxiliary power Heavy Duty 8 FT trailer wiring harness kit, 7 way trailer wire with 7 pin trailer plug & junction box kit. Provide a fast and simplified way for wires connection as well as keeping all your trailer wiring in order. 【DOUBLE PRONG TRAILER PLUG】- Cheemuii 7 pin trailer plug uses the premium copper double prong to replace the poor single prong, and the outer wrap is made of weatherproof and durable material to ensure a longer service life. 【JUNCTION BOX】- The junction box is equipped with 7 color-coded terminals and wires, which can easily identify the corresponding functions of the wires and facilitate wiring. Strong junction boxes are waterproof and dust resistant to increase the service life of trailer cords. 【PURE COPPER POWER CORD】- The 7-way trailer cord is made of high-quality pure copper and has a long service life. And has excellent electrical and thermal conductivity, to ensure the normal use of car lights in the process of driving (such as turn signal and brake lights, etc.). 【DETAILED WIRING INSTRUCTION】- CheeMuii trailer cords use 7 color-coded wires, and the color code adopted is suitable for most RV trailer wiring standards, but as there are some differences between trailer manufacturers, we have updated the detailed instructions, please read them carefully before use. Please refer to the wiring instructions and connect cables according to the color and function of the wires to avoid errors. 【WIDE APPLIATION】- Suitable for trailers, RVs, campers, caravans, food vans and other towed vehicles. Perfectly connected taillights, brake lights, reverse lights, turn signals and auxiliary power.