Light Ranger MUTT (7-Way Spade Pin). Test trailer lights, brakes, and 12V power without a truck. Avoid blown fuses and wasted time. Rugged, water-resistant, and made in the USA. (For 7 Spade pin. Test the Trailer Without the Truck! The Light Ranger MUTT is a portable, water-resistant diagnostic tool designed to test trailer lights, electric brakes, and 12V circuitswithout needing a truck. Built for light-duty trailers, it simulates the functions of a standard tow vehicle, allowing fast, fuse-free testing for RVs, boat trailers, landscape rigs, and more. The Light Ranger features a standard 7-way spade connector, commonly used on RVs, car haulers, and larger trailers. The Ranger MUTT includes a 3-way adapter to easily test 4-pin and 5-pin connectors typically found on boat and smaller utility trailers, as well as 6-pin connectors used on horse and work trailers. Whether you're performing a quick safety inspection or diagnosing a lighting fault, this trailer tester makes testing simple, safe, and accurate. With built-in short circuit protection, rugged construction, and USA-made quality, it's a must-have for technicians and trailer owners.