4-Way Flat Tester

4-Flat tester verifies taillight, right turn, and left turn functions.

With the ability to instantly check for connection and run on all types of trailers including 5th wheel, camper, UHAUL, or lighting accessory, this adapter guarantees 100% rear light functionality on your Chevrolet, Ford, Dodge, RAM, or GMC with any factory OEM 7 Pin plug.

7-Way Round to 4-Way Flat Pin Adapter for Trailer Tow Hitch & Redline Tailgate LED

The TowSmart 4-Way LED Light Tester is the quickest and easiest way to test 4-way flat trailer plugs on towing vehicles. Simply plug the light tester into your tow vehicle and the LED lights will illuminate to ensure all functions are working properly. The small compact design allows you to easily store in small spaces such as your glove compartment or pocket.

TowSmart 4-Way LED Trailer Light Tester

LED Trailer Wiring 4 Way Flat Circuit Tester Turn Tail & Brake Light Tester 50048

4-way/5-way Flat LED Circuit Tester

Curt Manufacturing 58261: Circuit Tester, Trailer Wire Tester, 4-Way Flat Connector, Each - CURT LED connector testers analyze taillight, turn signal, and ground connections. They come with LED lights to be bright and long-lasting. Part of towing responsibly is making sure your trailer lights are working properly. Let CURT help confirm proper function of vehicle-side wiring connectors.

Curt 58261 4-Way Flat Connector Tester

Our easy-to-use circuit tester helps you quickly identify and fix problems with your trailer light circuit. Simply plug it into the bumper connection or in-line between the tow vehicle and trailer, turn on the lights to be tested, and check the LED lights on the tester to identify the problems. If the LEDs are not coming on? Time to check the tow vehicle’s wiring.

4-Way Flat Trailer Wiring Tester [Nickel-Plated Copper Terminals] [Male & Female] [Continuity Test] 4-Pin Trailer Light Wire Circuit Tester

ABN 7 Blade 4-Way Flat Circuit Tester 12v Vehicles Circuits Connector Testing

4 Way Flat Trailer Wiring Tester Light Brake Tail Turn Signal Trouble Shooter Plugs Into The Connector Of The Tow Vehicle - AliExpress

4 Way Flat Trailer Wiring Tester Light Brake Tail Turn Signal Trouble Shooter Flat LED Tester connectors

4 way Flat Tester With Led Brake Tail Turn Signal Trouble - Temu

The TowSmart 4-Way LED Light Tester is the quickest and easiest way to test 4-way flat trailer plugs on towing vehicles. Simply plug the light tester

TowSmart 4 Way Light Tester