Is there a factory ground point in the trunk of my 2005 Saturn L300 if not where can i ground my amp at?

The 2005 Saturn L300 does not have a dedicated factory ground point in the trunk, but you can create a reliable ground by securing your amp's ground wire to a clean, unpainted metal surface on the car's chassis. Look for a bolt or a screw that can be used for this purpose. Make sure to sand away any paint or rust to ensure a good connection. Alternatively, you can run a ground wire to a common grounding point in the front of the vehicle, such as the battery or a grounding point near the engine.