Trailer Wire Connector Circuit Tester Trailer Buddy

Easy to use & saves time -- one person can make a complete test on 30 seconds! Tests four- & five-pin flat trailer wiring connectors. To test, simply apply brakes, turn signals, running lights, & engage reverse. Each signal from vehicle, or any wiring shorts, emits a unique tone. Tests left/right turn signals, brake/running/reverse lights & wiring shorts.