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Q:

Why do the low beams not work? They work when the high beams are on. on 1990 Mercury Grand Marquis

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
This started happening in December 2010.
(1) Answer
Check your headlight swtich. It may be faulty. The terminals on the wiring connector could also be damaged, burned, melted.