The Hummer H3 side marker requires a 194 bulb size for proper illumination and function. Data for the specified lighting component covers the range from 2006 to 2010.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Hummer H3 uses the 194 bulb for the front side marker position across the 2006-2010 model years.
The 194 bulb is an ANSI-standardized type recognized in the United States and Canada, operating at 12 volts with a power draw of 3.78 watts.
The 194 belongs to the T10 miniature wedge bulb family, a form factor defined by its wedge-shaped base, which seats directly into a socket without a separate metal base or pins.
Export-configured Hummer H3 vehicles without headlamps also use the 194 bulb for the front side marker position across the 2007-2010 model years.
The T10 wedge base is a widely used standard, meaning the 194 shares physical socket compatibility with several other bulb numbers in the same family, though wattage and voltage ratings still govern whether a substitute is electrically appropriate for a given application.
At 3.78 watts, the 194 is a low-wattage bulb, consistent with its role as a marker lamp rather than a primary illumination source.