Here is a close up view so you can see how to do it. The red wire HAS to go the instrument lights fuse. The black wire to any fuse that is hot when the key is on. When you turn the key off and the lights are still on the buzzer goes off. It makes a lot of noise---I will HEAR it. The buzzer is the black object on the right side of the fuse box. If it saves me from having to go back and turn the lights off it will be worth the $3.95. With good information this project should not take more than an hour.