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Hello I will help,
The fuse 2.13 in the under dash fuse block feeds the panel which activates the relay to get power from the 50 amp 1.17 under the hood to the blower motor.
Being a conversion I only know what Ford did for the front blower motor. If you have a rear then that would be a different system.
They may have spliced or cut the wrong wire when the put the brake in, do you have a voltmeter to check the circuit if I guide you?