Heavy Ranger Trailer Tester

• Connection Compatibility: Built explicitly for 7-way round pin SAE J560 arrangements. It is intended for commercial tractor-trailers, semi-trailers, flatbeds, tankers, and dump trailers (it does not support RV-style 7-way flat spade connectors). • Circuit Diagnostics: Verifies tail lights, turn signals, brake lights, back-up lights, ground integrity, and auxiliary power. It also provides full 12-volt power to check electric brake operation. • Built-in Protection: Features an auto-resetting short-circuit and overload protection system to shield both the tester and the trailer from damage during troubleshooting. • Rugged Construction: Encased in a water-resistant, durable housing equipped with an internal battery compartment and an external 12V DC power