Mercedes-Benz GL350 Map Light Bulb Size

Additional Notes

• The 12961 is the sole map light bulb type listed across all model years of the Mercedes-Benz GL350 covered in these specifications, spanning 2010-2016.
• The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, operating at 12 volts with a 5-watt output.
• T10 bulbs use a W2.1x9.5d wedge base, which is a pinless design that relies on the tapered plastic wedge of the bulb body itself to make contact within the socket.
• The W2.1x9.5d base designation indicates a specific wedge width and pin spacing standard, meaning substitutes must match this base geometry exactly to seat correctly in the socket.
• For the 2013-2016 model years, the 12961 bulb is specified with a Rear position designation, indicating its application is limited to the rear map light on those vehicles.
• The 2010-2012 model years carry no positional qualifier in the specifications, listing the 12961 without a front or rear distinction.
• At 5 watts, the 12961 is a low-power incandescent bulb, a wattage rating common to courtesy and interior lighting applications where prolonged use at minimal electrical draw is expected.
• The T10 wedge format is widely used across automotive interior lighting, and the 12961 shares its base type with numerous other bulbs in that category, though wattage and voltage ratings must align for a valid substitution.