You have to install a relay and fuse in the fuse box under the bonnet . You can buy the relay from a holden spare dept and they fit straight into the empty socket in the fuse box.. The wiring harness should have a plug either side near the driving lights , they are usually taped to either side of the bar just plug the lights into them . Plus you also have to fit a driving light switch to the dash , which also plugs straight in to the loom behind the dash .