4 pole Flat Trailer Light Plug Circuit Tester truck
This is a tester for the trailer light plug.
Analyzes tail light, turn signal and ground connections and confirms them with bright LEDs
This tester will test the following:
(If ground wire is disconnected non of the lights will work)
Checks conductivity of all circuits, Quickly identify lighting problems.
Test the plug before you drive to the repair shop and have them tell you that the fuse is blown in your truck and then have them charge you 30.00 to 40.00 for the service.