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Q:

headlamps wont turn on on 1999 Buick Century

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
it can flash but high and low beam wont turn on
(1) Answer
Usually the result of a poor (high resistance) connection at the headlight switch! Have the switch and the wire connector to the switch checked for signs of excessive heat, melted or deformed connector plug. If that is found the switch and connector needs to be replaced. Are the headlight bulbs original equipment type, number and candlepower, as far as you know? No high output or higher wattage bulbs installed?