I have a 2000 silverado and recently when i turn the truck off in park and touch my brake pedal it starts dinging and the orange marker lights under the headlights come on. Last night when driving to work with my headlights on my left blinker wouldnt blink it made a hissing sound under the dash and then would be solid until turned off. When off and parked the right blinker will blink but the left would make the tailights blink. Any help would be appreciated.