The Thexton Portable Trailer Light Tester, No. 838, utilizes alligator clips that allow it to be used with any power source. This lightweight, handheld 12V tester features an 8-amp breaker, and assists with testing left- and right-turn signals, taillights, reverse lights, electric brakes and auxilliary when combined with the Thexton No. 839 seven-blade to four-flat adapter.
