The Chevrolet Townsman front side marker bulb size measures 194 or 194NA, while the rear side marker bulb size measures 194. The replacement chart covers vehicle production years spanning 1969 to 1972 with corresponding bulb size specifications.
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 dominant type across the Chevrolet Townsman side marker specifications, appearing in both front and rear positions for the 1969-1970 and 1972 model years, as well as the rear position for 1971.
The 194 is classified under the ANSI standard recognized in both the United States and Canada, and it is a miniature wedge bulb of the T10 form factor operating at 12 volts with a power draw of 3.78 watts.
The T10 wedge base design means the bulb is retained by friction rather than a bayonet or screw mechanism, which is a common trait of low-wattage miniature lighting applications in this era.
The 1971 Chevrolet Townsman front side marker position specifies the 194NA rather than the standard 194, making it the sole instance of this variant in the dataset.
The 194NA shares the same ANSI classification, T10 wedge form factor, 12-volt rating, and 3.78-watt power draw as the 194, with the distinguishing feature being its natural amber-tinted glass envelope.
The amber tint of the 194NA is achieved through the glass itself rather than a coating or colored lens, which is the meaning of the "natural amber" designation in bulb nomenclature.
Because the 194 and 194NA are electrically and physically identical, the 194NA in the 1971 front side marker position produces an amber output without relying on an amber housing or lens to filter a clear bulb.
Substituting a standard 194 for a 194NA in the 1971 front side marker position would alter the color output of that lamp, as the amber tint would no longer be present in the bulb itself.