Ford F-150 Turn Signal Indicator Bulb Size

Additional Notes

• The Ford F-150 turn signal indicator uses the 194 bulb across all listed model years from 1975 to 1996.
• The 194 is a miniature wedge bulb, classified under the T10 form factor, which refers to a tubular bulb body approximately 10 millimeters wide at its widest point.
• The wedge base design means the 194 bulb has no metal pins or bayonet fittings. Instead, the glass envelope itself is pinched at the base to form a friction-fit connection within the socket.
• The 194 bulb operates at 12 volts and draws 3.78 watts, placing it in the low-wattage category typical of instrument panel and indicator lighting applications.
• The 194 is an ANSI-standardized bulb recognized in both the United States and Canada, meaning its electrical and physical specifications conform to a defined industry standard rather than a proprietary format.
• Because the 194 follows an open ANSI standard, it is produced by numerous manufacturers, and aftermarket or OEM-equivalent replacements are widely available in incandescent, LED, and other lamp technologies sharing the same T10 wedge base.
• When substituting an LED replacement for the 194 in the Ford F-150 turn signal indicator circuit, a load resistor or a compatible flasher relay may be required, as the reduced current draw of an LED can cause hyper-flashing in conventional relay-based turn signal systems.
• The consistent use of the 194 bulb across the 1975-1996 model range of the Ford F-150 indicates a high degree of parts interchangeability for the turn signal indicator position across those generations.