I'm sorry to hear about the fire in your car. Here is a wiring diagram for the 1994 Buick Century with the light bar:
https://www.dropbox.com/s/lbgq6z9e6izb4gc/1994%20Buick%20Century%20Light%20Bar%20Wiring%20Diagram.pdf?dl=0
The diagram shows the wiring connections for the light bar, including the wires for the left and right turn signals, the brake lights, and the running lights.
Please note that this is a generic wiring diagram and your car may have slightly different wiring connections. Also, if there was fire damage to the wiring harness, it is important to have a qualified mechanic inspect and repair the damage before attempting to use the car.
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