Hopkins Tow Doctor (TM) 4 Wire Flat/6 Pole Round/7 RV Blade Trailer Wiring Circuit Tester 50918 02-0245

Vehicle side circuit tester adapts to 4 wire flat, 6 pole round, 7 RV blade. Includes a 20 foot extension cord. Tests all tow vehicle functions including ground, auxiliary power lead, brake controller, directional and back-up lights. Heavy-duty 20 foot extension cord is included puts you in the driver's seat when testing.