If you look behind the passenger turret you will see a loom running through the fire wall through a rubber grommet, take a wire through here, under the scuttle panel and thread it between the top of the wing and body, the wire will then be at the back of the door shut. You will see a plastic blanking grommet in the door shut above where the door loom attaches, poke the wire through here and feed it into the car. You will need to remove the kick panels to get at the wire once its in the car. Can be fiddely. I assume its amp wiring?