I need electrical wiring diagram for my Malibu 2008 3.5

I just bought a Malibu 2008 3.5 but there's a lot of reparations wich I want to make, especially in electrical issues. For example the fuse box need to be replaced cause a lot of components are working with extra wires Wich are not part of the original arnesses and I don't want that situation compromise the function of main components as the engine, the blow motors, the HVAC system etc, please somebody share the electrical diagrams, best regards.