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OBVIOUSLY, a cracked or broken wire in the wiring harness is your problem.
Yes, any 1999 Buick will have a chain.
Check your wiring, but it is most likely the relay that selects bright or dim or a fuse.
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Buick City ended in 1999.
Where is the headlight sensor for a 1999 buick regal? Its in the back, sike ;D
If the headlights flash on and off, there may be a problem with the bulbs or fuses. There may also be a problem with the battery connections or wiring.
i believe it is the rear right speaker. if it is plain green with NO black, then it is the positive wire check this site out: http://www.modifiedlife.com/1998-buick-century-car-radio-stereo-audio-wiring-diagram/
how to replace window toggle switch 1999 buick century