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A circuit tester that plugs into the 7-way trailer connector on the vehicle and emulates a trailer. The lights let you know what functions (brake, turn, tail, stop, reverse and 12V) are working properly and what functions are not.

This tester helps you to quickly identify problems in your trailer wiring. It tests the left turn, right turn, tail/marker, brake and backup circuits to indicate the level of current in each circuit. It also tests the voltage of the trailer battery.

Circuit tester helps to quickly identify problems with your vehicle's tow package wiring. Tests brake controller output, brake and battery voltages, and signal circuits. 20' Long cord plugs into 7-way connector for convenient, in-cab testing.

This circuit tester plugs into the 7-way connector on your RV. LED lights indicate which functions (brake, turn, tail, stop, reverse and 12V) are properly working.

Tekonsha 7-Way Trailer Emulator Blade Style Connector

Quickee circuit tester with hook.

Circuit Tester Kit

This Brophy electrical tester works for both 4- and 5- way flat trailer wiring harnesses.

The automotive circuit tester helps to diagnose electrical problems with your vehicle, boat, trailer, RV, or motorcycle. This circuit tester tests 6, 12, and 24 volt systems for voltage. It comes with a 37" removable lead with an alligator clip.

Tester helps to quickly identify problems in your brake controller wiring. Tests brake controller output, short circuit or overload, and connection to indicate the level of current in each circuit.

Tester helps to quickly identify problems in your brake controller wiring. Tests brake controller output voltage, short circuit or overload, and connection to indicate the level of current in each circuit.

A circuit tester that plugs into the 6-way trailer connector on the vehicle and emulates a trailer. The lights let you know what functions (brake, turn, tail, stop and 12V) are working properly and what functions aren't.

Digital multimeter (DVOM) measures AC and DC voltage, amperage and ohms. The easy-to-read LCD screen provides accurate data. Test leads and battery included.

Circuit tester plugs into your 4-way flat trailer wiring harness and identifies lighting problems. Labeled LED lights illuminate to show which functions are working properly.

This adapter lets you test a 7-way, round-pin, vehicle-end connector to ensure that all the wiring functions are working properly. Plugs into the extension cord on your Hopkins Tow Doctor wire harness tester (HM50918; sold separately).