99 Buick century headlights will only work on high
beams if lever pulled back . Regular low beams will
not work what's the problem?
Burnt out bulbs. Replace both headlight bulbs.
Pretty sure there is a relay in the system. If it is stuck on High (or low) it will not change. The relay is probably under the hood in a box with other relays....there is usually a label telling you what each relay is for.....to test swap with another relay (they are usually all the same part number)
Your multifunction switch (I.e. turn signals wipers,cruise control) is bad. Get a good one (AC Delco) when you replace it, the cheap ones are junk, and the switch replacement is a little hard, but not difficult.
Looking for a Used Century in your area?
CarGurus has 818 nationwide Century listings starting at $1,999.
Search Buick Century Questions
Buick Century Experts