Check your wiring, but it is most likely the relay that selects bright or dim or a fuse.
Where are the relay switches on a 1999 Buick Century for the headlights
how do I remove the sunvisors off a 1999 Buick Century
how to replace window toggle switch 1999 buick century
Try it, if it doesn't work then all you have to do is go to Walmart and get an adapter for it.
5
99 ?
10W-30
The fuel filter for a 1999 Buick century is located on the drivers side frame in front of the fuel tank. It is an inline type and is easy to change.
Shift Cable
17 gallons
Check the fuses
Turn it floaty