Thanks to all for prompt replies.
I also found no power to the hitch brake pin.
Both fuses are good and have 12V.
I now remember that the brake did not disconnect cruise when we came down.
I agree that suggests a defective switch, but I've looked at the pedal area, and the only connection I see coming out of it is the pedal motor.
I looked at the firewall, but there are a thousand wires, and I have no idea what the switch should look like if it's there.
I'll call FTL for direction.
Thanks again.