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Why you have brake and tail lights when head are turned on 1997 GMC?

There are a few reasons why brake and tail lights turn on when the headlights are turned on in a 1997 GMC:

1. It's illegal not to have your tail lights on at night; 2. to make sure the driver behind you know your car is stopped;3. so you may been seen coming when changing lanes/pulling to a spot, etc.