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There is no simple answer to that. If the brake controller is set to 10, that is the maximum voltage it will put out, generally.
Taking for example a Prodigy inertial controller. If you set it to 10 and hit the brakes, the output will be somewhere between 0 and 10, depending on the deceleration sensed by the brake controller.
If you set it to 10, and pull the manual handle all the way over, you should read 10 volts at the plug.
OP has an '07 F350, so I'm thinking he has the Ford TBC. If so, if you are sitting still and just press the brake, you won't get much voltage out of the controller. On the other hand, if you squeeze the manual override levers, you should get a good hard brake out of it. Can't tell you what the voltage would be. Never needed to measure it.
Thanks for the replies, feel like a real idiot now never thought about inertia switch, no need in having power to the trailer brakes if the tow vehicle is parked.
no need in having power to the trailer brakes if the tow vehicle is parked.
I don't know about that. If I were stopped on a slipper hill (ice, gravel, grass, whatever) I would want all wheels holding no just the truck's wheels.