Help! I have a power drain on 73 rag mustang with key out of ingition. I've narrowed it down to the courtesy light circuit by process of fuse elimination and have unhooked all connectors to no avail. Is the seat belt warning buzzer and key-in buzzer tied to this circuit? Currently I have neither working but the seat belt light is operational. Where are they located and how do I check them. Any other ideas appreciated. Thanks.