1999 Mercury Grand Prix

I am having turn signal problems. The hazards work fine but when I use my blinker to turn left or right the front lights blink fine but the the left blinker and right blinker and brake lights all blink at same time. What would be causing this?

1 thought on “1999 Mercury Grand Prix”

  1. The first thing I would check would be the bulbs to make sure they are the correct ones. Not sure if this vehicle applies but there are some cars that react this way if one of the bulbs are not the same. You could remove one rear light at a time to see which one is causing the problem. Include the third brake light bulbs.

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