Normal to always see some voltage on Elec Brake pole of 7way

I haven't measured mine but understanding how the brakes work, I would not expect to see any or very little voltage on the line until the brakes are activated.

Not sure about that tester light but seems if it indicates voltage on the other pins of the connector something else is wrong. The other lights probably represent running lights, left and right turn/brake lights, and 12 volt power to the trailer.