I have a 1999 Ford F-150. I replaced front left turn signal bulb and it still does not work. What could it be, could it be the dash bulb? It would not be the fuse, then none of lights would work right?

 

there may be a single fuse for just the turn signal. i highly doubt all the lights would go through one fuse. you could always take 5 minutes and just check them..

 

If you turn on the turn signal, you should hear an audible click coming from the flasher relay whether or not the turn signal indicator light is working or not. If the click is slow, everything is okay, if it blinks fast, you've got an out bulb/filament.