Bad ground or bad switch
Headlights, interior lights, parking lights,Headlights, interior lights, parking lights,
The headlights work on a totally different relay than the parking and fog lights. The headlight relay or headlight fuse is usually blown when only the parking and fog lights work.
it could be the headlight relay. if not it may be in the switch.
I would start with replacing the head light switch
iT CAN BE WIRING OR BAD HEADLIGHT SWITCH.
On a 2005 Ford Mustang : Either put your park lights or your low beam headlights on and then pull the headlight control out towards you to turn on the factory fog lights
That's how 1964 1/2 thru 1967 Mustangs lights are designed to operate.. when the headlamps are turned on the amber parking lights are turned off. That was changed sometime in 1967-68 so that the amber parking lights remain on when the headlamps are on.. It is possible to install a later model (1968) type headlight switch and wiring if you really want the parking lights to remain on when the headlamps are on however. Electrical Wiring drawings are available (to purchase) for every year mustang from almost any mustang restoration shop/website.
If parking and tailights are working could be headlight switch--rheostat for dimming control could be bad
Check fuse for parking/tailights Could be a bad headlight switch
Turn the headlights on the whole way, then push the headlight knob back in, leaving the parking lights still lit. This will hold the headlights up, without having them turned on.
The headlight switch may be at fault or the wiring has been altered.
parking lights are in the back of ur car and headlights ar in front of ur car