Originally Posted by clatla
Thanks for the offer but the controller won't even turn on unless it senses the connection to the trailer. So there would not be anything at the 7 pin except the 12v.
Did you get your problem solved?
Maybe you have trouble with your trailer.
If you disconnect the trailer from your vehicle and check the resistance on the trailer between the electric brake wire and ground you should see 3 to 4 ohms assuming you have only two wheel braking.