Which fuse disables daytime running lights on a 1999 ford expedition?

There isn't a single fuse that solely disables daytime running lights (DRLs) on a 1999 Ford Expedition. The DRL system is integrated into the vehicle's electrical system and controlled by the Body Control Module (BCM). Removing a fuse related to the headlights or the BCM might affect the DRLs, but it would also likely disable other essential functions. This is risky and not recommended.

To disable DRLs on a 1999 Ford Expedition, you would typically need to either:

* Modify the BCM programming: This requires specialized equipment and knowledge. A professional automotive electrician or a shop specializing in electronic repairs might be able to do this. It's the most reliable way, as it's the intended way to modify the functionality.

* Use an aftermarket DRL control module or switch: These devices are available and can interrupt the DRL circuit without affecting other systems.

Attempting to disable DRLs by pulling fuses is strongly discouraged. You risk causing damage to other electrical components or creating a safety hazard.