Ok. I have searched every forum i can find and no one can seem to help me on this very weird issue. 2008 Chevy Tahoe LTZ 4X4 5.3L. My left front turn signal doesn't work. The mirror signal and rear signal work. Whats weird is I have to leave the bulb out because when I plug it in to the bulb holder the bulb immediately lights up and stays lit. With no key in ignition and lights off and blinkers off But it gets weider. As soon as I plug in the bulb there is a loud whistling noise that comes from the washer fluid pump. Now if I leave the bulb lut the washer pump works fine no whistling noise. And i can't leave bulb in and unplug the washer pump because the light just stays on no matter what I do. Please help me out. I know I am over looking something or maybe someone has heard or seen this problem before. And I am pretty good at trouble shooting electrical issues but this one has me stumped. Thanks for any help you may be able to give. I appreciate your time and effort in helping me out with this. It's late tonight but I will attach a short video tomorrow to this .