i made an escalade in blender but i have come to a halt at the head lights.
any ideas on how to create a realistic headlight with out it being on 
I suppose Escalade is a car.
To model realistic headlights you need to look closely how the headlights are made - the reflectors (mirrors), the plastic pieces inside that keep the headlight together and the glass piece.
Model them separately and you should have a good looking headlight.