The StarryTow 4 way trailer light tester  plugs into the 4 way trailer connector on the vehicle. The bright LED lights analyze the trailer connections and indicate which functions (tail, left turn and stop, right turn and stop) are working properly and which are not ;

Used for testing 4 way flat trailer plugs on tow vehicles

Checks the tail, left turn and stop, right turn and stop lights

Tin plated corrosion resistant terminals