The Calterm circuit tester is used to test the power supply from the tow vehicle to the trailer. The LED lights up to confirm the functionality of your vehicle's trailer wiring harness for the tail lights， brake lights， reverse lights， turn signals， electric trailer brakes and auxiliary power. Use on 7-way round tow plug.
Tests 7-way round tow plugs individually
Easily determine if wiring is correct between tow vehicle to trailer
Plug into vehicle's tow plug and operate lights， brakes and turn signals to test circuits
LEDs light up to indicate a good signal
Durable housing is impact resistant for long use and dependability
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