Originally Posted by Brandon002

Remove the bulb holder for the bulb that isn't turning on. Check it for corrosion. If there is corrosion take a pencil eraser and remove the corrosion with it.

Reinstall and see if the light comes on. If it does you are good to go, if it doesn't slightly bend the tabs on the bulb holder out so that they make better contact when installed. Try again and the light should be on. I had a similar problem with mine two days after buying it and this fixed it for me.