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This Trailer Wire Connection Box perfect for mounting on your trailer to give you easy access to the wiring connections. Makes everything so much easier for diagnosis and troubleshooting when you need to replace a wire. Great choice when you are upgrading old trailer wiring and add accessories circuits to your trailer! Best Sealing Performance A sturdy plastic housing with seven terminal studs provides a weatherproof protection to organize your trailer wiring. The box came with 4 closed and 4 open rubber grommets, give you multiple practical wiring options, making the whole junction box waterproof, dustproof and corrosion resistant. No Wrong Wiring There are specific color name printed on the top of screws, easy to identify and makes working or diagnosing electrical problems much easier. Very convenient for wiring up turn light, brake signal lamp, reverse light and other accessories, perfect for your RV, trailers, camper, caravans, food vans and other towed vehicles. Blue - Electric Brake Brown - R Stop & Turn Green - Tail & USC Red - L Stop & Turn Yellow - Center AUX Black - 12V Charge Line White - Ground