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The bulbs are most likely burnt out. Right Front will be difficult to replace. Rear bulb is easy. You need to open trunk and find 4 nuts that hold the light in and remove them and the taillight will come out rearward. Locate the bad bulb your owners manual will tell you the number. It also will be on the bulb. The front I replaced when one of my headlights went out and I had to take apart the front of the car and I replaced ALL the bulbs and put it back together.
You may have a loose or corroded headlight ground to the body, the ground wires are in most GM attached to the body near the headlight under the hood. Check all the grounds you can see on the inside of the fender, tighten and clean the with a wire brush, also check the headlight connector for problems like corrosion or not fully seated to the headlight bulb.
Usually a fast turn signal means that there is a light out. You should probably check all of your lights, including back-up lights, and turn signals. If there is one out then replacing the burnt out bulb should fix the problem.
There should be at least 2 bulbs in the light assembly. One light is the light that is on when you turn on your headlights with out the brake pressed, the other light only lights up while you press on the brake. Make sure you are replacing the correct bulb. You may have been replacing the bulb that stays on. Your lights may be set up to turn off the light that stays on when the headlights are on while pressing the brakes.
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