Ford Transit Connect Map Light Bulb Size

Additional Notes

• The Ford Transit Connect map light uses two distinct bulb types across its model years, with the 6411 festoon bulb fitted to 2010-2013 models and the 12961 wedge bulb fitted to 2014-2020 models.
• The 12961 is a Philips part number designation for a T10 miniature wedge bulb with a W2.1x9.5d base, operating at 12V and 5W.
• The 6411 follows the ANSI standard used in the United States and Canada, classifying it as a festoon bulb with a 36mm length and an SV8.5 base, also rated at 12V and 5W.
• A festoon bulb is a cylindrical lamp that mounts by pressing its end caps into spring clips, while a wedge bulb uses a pinched glass base that inserts directly into a socket without a separate metal base.
• The W2.1x9.5d base designation on the 12961 describes a wedge-type connector where the glass pinch itself acts as the base, with contact made through the wire leads embedded in the glass.
• The SV8.5 base on the 6411 refers to a festoon-style contact base with an 8.5mm contact width, a standard fitment in many European and North American interior lighting applications.
• Both bulb types share identical electrical ratings of 12V and 5W, meaning power draw is equivalent across all Transit Connect model years covered in the specifications.
• The 12961 and 6411 are not interchangeable, as the wedge and festoon formats require physically different socket types, making the bulb type specific to the socket present in a given model year.