I have a 1984 500 SEC. Blower went out too. Not fuze but blower resistance group. Not sure of your location but may be same as mine. On the driver side in the engine compartment under the brake master cylinder (you may need a flash light) is the resister group. A small metel box with holes in it (like swiss cheese). Inside the box a series of springs (or resistors) My problem is debris had collected in and around the box and caused the resistor to over heat. Wires got melted. Hard to work on but a little patience and you can get it out. Bought a new group, and blower moter at Rusty's. Works great now.

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