OEM trailer brake controller problem, "trailer not connected"
Hi all. I need a hand please. My truck is an '11 FX4 with the tow package. I've installed the OEM integrated trailer brake controller. I took it to the dealer yesterday to have it activated. The problem is that when I hook up my trailer the display on the truck reads "trailer not connected". All of the lights work properly, I've checked the grounds and when checked the connection for the brakes where the trailer plug is spliced into the wiring harness.
The bizarre part is that if I move the manual slider on the TBC it will engage the brakes (but still shows not connected). I used a test light on the truck side of the plug to check for voltage. I am getting power to the brake wire with the slider but not if I depress the brake pedal.