Ford Explorer Sport Trac Map Light Bulb Size

The Ford Explorer Sport Trac map light utilizes 578, 168, and PC579 bulb sizes for the interior lighting components. Available data covers a range from 2001 through 2010 for the specified vehicle.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2007-2010	578
2004-2005	168
2003	PC579
2001-2002	168

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V, 12W.	578
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168
ANSI standard (US & Canada). Festoon bulb with printed circuit board socket. 12V.	PC579

Other Locations

Additional Notes

The Ford Explorer Sport Trac map light draws from three distinct bulb types across its 2001-2010 model years: the 578, the 168, and the PC579.
The 578 is a festoon-style bulb measuring 41mm in length with end-cap contacts, rated at 12V and 12W. It fits the Explorer Sport Trac for model years 2007-2010.
The 168 is a T10 miniature wedge bulb rated at 12V and 4.9W. It is the specified map light bulb for the 2001-2002 and 2004-2005 model years.
The PC579 is a festoon bulb fitted with a printed circuit board socket, rated at 12V. It is specified exclusively for the 2003 model year.
All three bulb types carry ANSI standard designations valid in both the United States and Canada.
The 578 and PC579 are both festoon-style bulbs, but their socket designs differ. The 578 uses end-cap contacts while the PC579 uses a printed circuit board socket, making them non-interchangeable despite sharing a similar physical form.
The 168 wedge bulb and the 578 festoon bulb are not interchangeable. Their socket types, physical forms, and wattage ratings are all different, and substituting one for the other is not supported by these specifications.
At 12W, the 578 draws notably more power than the 4.9W 168, reflecting a difference in output intensity between the two bulb types used across the model range.
The PC579 specification does not include a wattage rating, distinguishing it from both the 578 and the 168 in terms of available electrical data.
The 2006 model year is absent from the specifications, meaning no bulb size data is provided for that year.