[VetteVet]

If your fuse blows when you step on the brake pedal then you have a short in the white wire going to the steering column or in the column itself, or in the left and right turn signal wires.

Put in a fresh fuse and unplug the column connector, does the fuse blow? If yes the short is between the stop light switch and the column connector. If no, then the short is in the white wire that goes up into the column.

Use an ohmmeter and check for zero ohms on the white wire in the column connector and the column, or any good ground. You are looking for no reading on the meter.

Be sure that the turn signal lever and the hazard switch is off.