Unscrew bezel and switch should slide out through the rear (under dash)
Is it the "pull out" knob type? If so, there is a little silver button on the rear side of the switch. Depress this button and pull the knob all the way out of the switch Then unscrew the bezel to remove aswitch from the rear Ford recommends replacing the connector also.
Salvage yard or dealer.
Prior to do any work on your 1967 Ford Mustang, you must disconnect the battery ground cable from the battery. Next, remove the two screws and lower the parking break and air control. In order to remove the control knob and shaft assembly, place the know in the full ON position. You will now be able to press the knob release buttom on the switch assembly.
Below and to the left of the steering wheel, it is a pull out style knob.
If you pull out on the knob the third light will light up.
Rotate the headlight switch knob left or right with headlights turned on.
The knob on a shifter for a 1989 Mustang LX 2.3L can be replaced by unscrewing the old knob and putting on a new knob. On many shifters, this knob can be replaced with an aftermarket version.
Shift cable needs to be adjusted.
There is nothing adjustable on that system, except whatever the headlight knob has available. That is usually just a timer adjustment. As far as sensitivity adjustments there are none.
On a 1996 Ford E-150 : Rotate the headlight knob in your dash fully COUNTERCLOCKWISE to turn on the courtesy and cargo lights
OPen the hood, by the headlight there is a knob you can turn either up or down.