Sea Sense 50080304 EZ Troubleshooter 4-Way Circuit Tester

Plug tester into vehicle's 4-way flat towing plug. Operate vehicles turn signals, lights and brakes. When power is present, that circuit's green light will glow.

SeaSense EZ Troubleshooter 4-Way Circuit Tester: EZ Troubleshooter 4-way circuit tester plugs into vehicles with conventional 4-prong flat towing plug Operate vehicles turn signals, lights and brakes When power is present, circuits green light will glow Trailer wiring tester is made of waterproof PVC material Easy to use