[Gooseneck]

Are your other park lights working? If not, check for a blown fuse. The park and signals are two separate circuits although they use the same bulb. Your signal and park light are the same bulb or bulbs but they are duel element. Since you have replaced the bulb, that pretty much eliminates that, if you replaced it with the correct duel element bulb. If you have a voltmeter or a test light you can check for voltage in the light socket. One pole is for signal and one is for park light, the ground is common for both elements. If just this one park light is not working it is probably a problem with the bulb socket or assembly or the wiring in the close vicinity of the light. Make sure socket is free of corrosion.