Hello, my name is Ben. It's possible that both bulbs have burned out. Have you verified voltage going to the plug where it goes into the back of the headlights? As for your right headlight clicking. The most likely cause is the plastic gear inside the headlight motor is worn out. The gear will need to be replaced, or eventually the motor won't raise or lower the headlight. There are brass gears made as an aftermarket part that are vastly superior to the stock GM plastic gears. I hopes this helps. Feel free to ask any other questions if you need more information.
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