De-Bug Plug 7 & 4-Way Circuite Tester DBP7+4 69-8899

Plug into tow vehicle’s tow plug and quickly test power to your trailer’s turn signals, brakes, running and back-up lights. Also shows if wiring circuit is properly configured. Great for troubleshooting. One end is for 7-way round plugs with blade connectors, the other end for 4-way flat. Long-lasting LEDs