Do you lose power on the orange wire after those 8 seconds? If yes, then you need to get to the ECM and see if you are losing power on the red wire going to it after 8 seconds - if the red wire has power and the orange wire loses power at the ECM, either the lights are drawing too much current and the ECM is tripping out or the ECM is defective. Try it with the lights off. Also as voltage drops current increases, so having a low or discharged battery will cause the ECM to trip out unnecessarily. If the red wire loses power after 8 seconds, then there is a faulty connection at the battery, frame ground, or the fusible link is faulty.