Mercury Sable Map Light Bulb Size

Additional Notes

• The Mercury Sable map light specifications reference four distinct bulb types across the model's production years: the 212-2, 578, 211-2, and 906.
• The 212-2 and 211-2 are both festoon-style bulbs with an SV8.5 base, a 41mm length, and identical electrical ratings of 12V and 12W. Both conform to ANSI standards applicable in the US and Canada.
• The 578 is also a festoon bulb with a 41mm length and 12V, 12W ratings, but it uses end-cap contacts rather than an SV8.5 base, which distinguishes it physically from the 212-2 and 211-2 despite sharing the same voltage and wattage.
• Because the 578 uses a different contact type than the 212-2 and 211-2, these bulbs are not directly interchangeable even though their electrical output is equivalent.
• The 906 is a miniature wedge bulb of the T10 type, rated at 12V and 8W. Its wedge base and lower wattage make it a physically and electrically distinct type from the festoon bulbs listed in the same specifications.
• For the 2008-2009 Mercury Sable, the front map light position uses the 212-2 bulb while the rear map light position uses the 578, indicating that two different bulb types are required within the same model year.
• The 211-2 appears in the 1997 and 1999 model years, while the 578 appears in the 1996 and 1998 model years, showing alternating bulb type assignments across those four years depending on the specific model year.
• The 1986 Mercury Sable map light specification calls for the 906 wedge bulb, which is the only non-festoon type present across all listed entries.