I have a 2007 tundra with the trailer package. According to the Tundra diagram on this site, I have a RV1 type plug. I am measuring the current off the Tundra supplied harness before connecting it to my Tekonsha. I get a good 13.97 volt current on the primary leads and a good 12.5 volt current on the green lead for the turn signal and brake lights; however, I get nothing on the red lead for the brakes. 0.00 Volts idle and 0.00 volts with the brake depressed. The harness continuity checks out, so where is the signal being lost. I expected to see current on the brake lead when depressed in order to activate the Teknonsha brake controller for my boat trailer????