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The battery saver relay in a 2003 Ford F-250 can be found on the left side of the fuse block in the driver's area. It is activated by the Generic Electronic Module and is responsible for turning off any courtesy lights that are inadvertently left on after the key has been turned off, usually with a 10-minute delay. During this time, the relay coil is the only component receiving power. A malfunctioning battery saver relay can lead to a voltage drain, resulting in a dead battery if the vehicle sits unused for a day or two. An important indication of this issue is a dead battery, which is a common consequence of the battery saver circuit continuing to operate after the ignition key has been turned off.
The battery saving relay for the 2003 Ford F250 can be found on the left side of the fuse panel in the driver's side section.