You said that the brake controller output circuit was the number 2 circuit on your 7-way. If by that you mean the 2:00 position then you have the circuits flip flopped. The 2:00 position should be the 12 volt accessory circuit, not the brake output circuit. That would explain why you are getting 12 volts all the time.
The brake controller circuit should be the 5:00 position. Check out the diagram I attached to see how it should all get wired up. view full answer...
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