92 300e

My "light out" indicator comes on in both parking and headlight positions. All bulbs in rear have been replaced with osram. And gounding the tailight assys direct to the battery made no difference. The front and rear passenger side parking lights do not come on in the parking position but do work do work in the headlight position.... The driver and pass standing lights work in their respective positions. What do I do next? Any ideas would be appreciated, thanks.