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Q:

interior lights and signal lights not functioning on 1999 Mercury Cougar

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
The interior light, windows
and window motor, and signal lights are not functioning
(1) Answer
I would check fuses first - see if you have a common fuse blown. Then after that, if you find one that is, you may need to see why that fuse would have blown.