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If you're referring to the switch that screws on to the front of the master cylinder, Ford calls it "Cruise Control Deactivation Switch". If that's the one, then you should know that Ford issued a massive recall on those, as they are prone to short out and catch on fire. Give Ford a call at 1-***-***-**** and mention recall campaign 09S09. They'll take care of it for you free of charge.
To clarify; do you mean the one that makes the stop lamps come on?
OK. Neither hazard nor running lights have anything to do with this switch or its circuit, only the stop lamps. can you share a little background on how this problem first started?
I see. When you say you replaced the brake interlock, do you mean the solenoid/actuator in the steering column? If so, and the fuse still blows, can you disconnect both the actuator and the brake switch and check continuity to ground on the Light Green wire between the two components?
OK. Just let me know and we can continue when you're ready.