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MICTUNING Heavy Duty 7 Way BladeTrailer Tester Connector When you're going to hitch a new trailer, all electrical components on your trailer should be tested before working. MICTUNING 7 way trailer connector testers for testing tail lights, turn signals, brake lights, ground connections and other electrical components on trailer. Instead of checking individual fuses, wiring and connectors, you simply plug this tester into tow vehicle and led indicator will show the corresponding circuits work or don't. Take this small lightweight 7 way trailer tester light circuit connector wherever you go and own peace of mind!!! Features 6 LEDs, testing circuit for the tail lights, brake lights, reserve lights, left turn signal, right turn signal and auxiliary power. It works by plugging in the connector socket of your vehicle end and seeing the lights display. Each of the indicator light with clear labeling to tell you which of your towing vehicle lights work or don't. If socket is getting proper power, the tester's various LEDs will light up. When you're going to hitch a new trailer, you own peace of mind because you make sure the lights are connected properly Functional Labeling : BU: Back up or reverse circuit center pole RT: Right turn/brake T/M: Taillights LT: Left turn/brake BK: Brake controller output 12V: 12-volt power feed