I a 91 f150 4x4 from canada. the problem is that you have to play with the head light switch to get both park, and head lights to come on. I have changed the switch, pig tail, and dimmer. With the switch all the way out only head lights come on. This problem just started one day, does anyone have anny ideas??????

 

Did this start happening when you changed the switch?

It really isn't much but a inconveniose(sp?). I beleive it is in how they made the switch. I have about the same problem with my F-150 with a brand new switch.

When you pull the switch all the way out you only get headlights correct? No parking or instrument lights?

If that is the case just tab your switch in a little & they all should illuminate.

 

It happened before I changed my switch.

 

I had the same problem and made some of the changes you made with no success. The problem turned out to be the "trailer" fuse located in the In-Cab Fuse panel. All that messing around for a 15 amp fuse still has me bothered.