Tow-Ready 5-Flat Trailer Wiring Circuit Tester 20115 02-0037

Plug these testers into any car connector and you will have an instant test of running light circuits. Features LED display to show completed circuit for the running lights, left turn signal and right turn signal. Auxiliary circuit LED display is included on the 5-way tester, auxiliary and electric brake are included on the 6-way tester, and auxiliary electric brake and battery charge are included with the 7-way tester. One piece units with internal ground.