The dome light relay in a 2003 Ford Excursion is responsible for controlling the vehicle's interior lights, including the dome light. If the dome light is not functioning properly, it could be due to a faulty relay, blown fuse, or issues with the light switch. To locate the relay, check the fuse box under the dashboard or in the engine compartment, referencing the vehicle’s manual for the specific relay location. Replacing the relay is typically straightforward and can resolve many dome light issues.
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