Try a search in Class C. IIRC, there are two connectors that pigtail CAN connect to. Two different colors. One is Brake Controller and the other is ??? I forget. I was wiring one of those on a Ford an thought the connector didn't go hot till the key was on. As a result I blew a fuse in the underhood panel. I decided to replace fuse with auto reset breaker, but the points I want to make are 1, You may have pigtail plugged into the wrong connector and 2. You may have a blown fuse supplying the controller. All you have is Battery, Ground, Brake Pedal and Brake Controller Output to Trailer.
If you want to test Output without a Trailer connected, you need to use a Light Bulb. An LED or DVOM isn't enough load for the Controller to "See" it.
Oh, do you have the Controller adjusted to PRODUCE Output? On a cheaper Tekonsha controller, we had no trailer brakes, checked, poked, prodded and kicked. They prayed. Realized the Control Knob had been set to Minimum.
