I need some help with my Windstar -98

I have a problem with my rear parking light....
all the fuses are in good condition.
the problem is that I don´t have any power to the lamps.
the only light´s who is workin is the breaking and the turning lights.
is it any one here who can help my.....
the car is a Ford Windstar of 98 yaers modell
tanks for some help

stefan in sweden