Check both ends of connections carefully at the starter solenoid near battery and make sure grounds are clean on both ends. Good luck.
OR- check the fuses under the hood... I had a similar problem on my 95 Ford E350. Solution was to replace the 60 amp fuse (3rd inline counting from bumper side) located right under the master brake cylinder.
Aloha
Headlights, interior lights, parking lights,Headlights, interior lights, parking lights,
Check the fuse for the headlights. It is probably open.
The parking lights are turned on when the headlights are on and you pull out on the light switch. The parking lights cannot be turned on by themselves.
could be bad wiring
it could be the headlight relay. if not it may be in the switch.
depending what year check the turn signal switch. on the end if you turn it counter clockwise the parking lights should come on and if your turn it further the headlights will come on..
I would start with replacing the head light switch
iT CAN BE WIRING OR BAD HEADLIGHT SWITCH.
you need turn switch assy
Do you mean the parking lights? if it's the parking lights that are on, check the switch on top of the steering column.
If parking and tailights are working could be headlight switch--rheostat for dimming control could be bad
if you've tried hitting the high/low beam switch & headlights are out on both, then a bad headlight switch or headlight switch plug or high/low beam switch plug not fully engaged.