The GMC Yukon side marker utilizes a 194 bulb size for illumination across all listed vehicle applications. Data for the specified lighting component covers the period from 1995 through 2014.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 194 bulb is the most widely used type across the GMC Yukon side marker specifications, appearing in both front and rear positions across the majority of model years listed.
Both the 194 and 194NA are ANSI-standardized miniature wedge bulbs of the T10 form factor, operating at 12 volts and drawing 3.78 watts.
The T10 wedge base is a pinless design that seats by friction, relying on the wedge shape of its base to make electrical contact within the socket.
The 194NA variant differs from the standard 194 in that it uses natural amber-tinted glass, which produces an amber output without a separate colored lens.
On the GMC Yukon, the 194NA is specified exclusively for the 2014 front side marker position, while the rear side marker for the same year uses the clear 194.
Substituting a standard 194 in place of a 194NA in the 2014 front side marker position would result in a non-amber output unless the housing lens itself provides the amber coloring.
The 194 and 194NA share identical electrical ratings and physical form, meaning the distinction between them is optical rather than mechanical or electrical.
Front and rear side marker positions on the 1992-1999 Yukon both use the standard 194, indicating no color differentiation was built into the bulb specification for those years.