Ford F-150 Parking Brake Indicator Bulb Size

Additional Notes

• The Ford F-150 parking brake indicator uses the 194 bulb across all specified model years, spanning 1975-1996.
• The 194 is an ANSI-standardized bulb recognized across the United States and Canada, meaning it conforms to a defined set of electrical and physical standards shared by multiple manufacturers.
• The 194 bulb follows the T10 miniature wedge form factor, a base type that relies on two angled plastic legs to friction-fit into a socket rather than using a metal screw or bayonet base.
• The bulb operates at 12 volts, consistent with the standard electrical system voltage found in conventional passenger and light-truck vehicles.
• At 3.78 watts, the 194 is a low-wattage bulb, a characteristic typical of instrument panel and indicator lighting where heat output and power draw are kept minimal.
• Because the 194 is an ANSI-standardized T10 wedge bulb, aftermarket and OEM replacements from different manufacturers are generally interchangeable as long as they carry the same 194 designation and match the 12V, 3.78W rating.
• The T10 wedge base is a press-fit design, so socket compatibility depends on the physical size of the wedge base itself rather than a locking mechanism, making incorrect installation possible if a visually similar but dimensionally different wedge bulb is substituted.