The 194 bulb is the sole bulb size specified for both the front and rear side markers on the Dodge W100 across all listed model years.
The 194 bulb conforms to the ANSI standard recognized in the United States and Canada, classifying it as a regionally standardized automotive lamp.
It is a miniature wedge-type bulb, designated T10, which refers to its tubular shape with a wedge base that requires no separate socket pins for retention.
The 194 operates at 12 volts with a power draw of 3.78 watts, placing it in the low-wattage category typical of marker and clearance lighting applications.
The front side marker position on the Dodge W100 uses the 194 bulb across the 1975-1977 and 1984-1989 model years as listed in the specifications.
The rear side marker position uses the same 194 bulb, with fitment data covering the 1986-1989 model years.
Because both the front and rear side marker positions share the same bulb size, a single 194 bulb serves as a direct replacement for either location on applicable model years.
The T10 wedge base format is a widely produced standard, meaning the 194 bulb is available in original incandescent form as well as LED equivalents that retain the same base configuration.