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Description: Functions and Benefits: Tests 7-spade, 6-round and 4/5-flat pin number type trailer harnesses. Short circuit protection. Turn signal simulation and power verification BROUGHT. Water resistant. Tests lights and electric brakes. The Gentle Ranger MUTT is a portable and water-resistant trailer tester that allows you perform all testing features without the use of the vehicle. The Light Ranger MUTT simulates all electric circuits of standard dragging vehicles for boating, RECREATIONAL VEHICLE, landscaping, hunting and similar type light duty trailers. Included with each specialist is a battery charger plus 3-way trailer harness adapter. Internal battery compartment (battery not included).