Jeep Grand Cherokee Map Light Bulb Size

Additional Notes

• The 12961 is the most frequently specified map light bulb across the Jeep Grand Cherokee model years covered, appearing in seven of the listed years. It is a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W.
• The T10 wedge form factor appears across multiple bulb designations in these specifications, including the 12961, 192, and 906. Despite sharing the same physical base type, these bulbs carry different wattage ratings of 5W, 3W, and 8W respectively, which means they are not interchangeable without accounting for wattage differences.
• The 192 and 906 are both ANSI-standard T10 miniature wedge bulbs operating at 12V, but the 906 draws 8W compared to the 192 at 3W. The Grand Cherokee specifications use the 192 for 2003-2005 and 1999 model years, while the 906 is specified for 1994-1995 and 1997-1998.
• Festoon bulbs appear in several model years and span three distinct designations: the 578, 214-2, and 212-2, as well as the 561. The 578, 214-2, and 212-2 all share a 41mm length and 12V, 12W ratings, but differ in base construction.
• The 578 uses end-cap contacts, while the 214-2 and 212-2 use an SV8.5 base. This base difference is a fitment consideration, as the socket design in the vehicle must match the bulb's contact type.
• The 212-2 and 214-2 are both 41mm SV8.5 festoon bulbs with identical electrical ratings, yet the Grand Cherokee specifications assign the 212-2 only to the 1993 model year and the 214-2 only to 2015. These two bulbs are electrically and physically similar, though they carry separate ANSI designations.
• The 561 is specified exclusively for the 1996 Grand Cherokee. At 44mm in length, it is slightly longer than the 41mm festoon bulbs used in surrounding model years, making it a distinct fitment that is not directly interchangeable with the 578, 214-2, or 212-2.
• The 578 festoon bulb is specified for the 2007-2010 Grand Cherokee. Its end-cap contact design differs from the SV8.5-based festoon bulbs used in other years, and substituting one festoon type for another without confirming socket compatibility risks an improper fit.
• The 12961 carries a Philips-specific part number rather than an ANSI designation, unlike the other bulbs in these specifications. It is electrically rated at 12V and 5W, making it the lowest-wattage bulb among the T10 wedge types listed.
• The Grand Cherokee map light specification shifts across several distinct bulb types over the model years covered, including T10 wedge and festoon configurations with varying base styles and wattages. A bulb selected for one model year is not necessarily a suitable replacement for another without confirming that both the base type and wattage rating match.