It's a 99 so it's OBDII.
That method won't work.
What you might find is that your cigarette lighter fuse is blown.
The OBDII port shares that power supply.
Look in the cab fuse panel for a 25A fuse blown, position 17.
You may need to pull the radio surround bezel and replace or disconnect the lighter, if it is shorted out, blowing that fuse.