A lot depends on your brake controller functioning properly. There are thousands of pounds to be managed and brought to a halt every time you stop your truck and trailer. The CURT trailer brake controller tester box is an advanced safety measure designed specifically for testing the functions of brake control units. A brake controller is a powerful and sophisticated tool, but as with any tool, it is important to inspect it once in a while. The CURT trailer brake controller tester tests the brake activation function of a brake controller by showing the voltage output while braking. It also checks brake light activation, short circuit protection and disconnect notification. The CURT brake controller tester is compatible with time-based and inertia-based trailer brake controllers and is equipped with a quick plug connector to plug into any CURT brake controller. Testing your brake controlle