I have a 2013 Durango, I noticed the other day that when I turn right blinker on, my front right turn signal does not blink--instead both fog light blink. The right tail light blinker works normal, and the front and rear left turn signal lights as they should. I replaced the lamp socket, it was black around the bulb, thought that may be the problem, but it was not. The front passenger side marker lights up normally, just the blinker part is messed up. What would cause this?