Toyota Corona Instrument Panel Bulb Size

Additional Notes

• The 194 bulb is the most frequently specified instrument panel bulb for the Toyota Corona, appearing across twelve of the fourteen model years listed, spanning 1969-1974 and 1976-1981.
• The 74 bulb is specified for the Toyota Corona in 1975 and 1982, making it the less common of the two bulb types in these specifications.
• Both the 74 and 194 are ANSI-standardized miniature wedge bulbs rated at 12 volts, which is consistent with standard automotive electrical systems of that era.
• The 194 bulb follows the T10 wedge form factor and draws 3.78 watts, while the 74 bulb uses the smaller T5 wedge form factor and draws only 1.4 watts, meaning the two types are not interchangeable despite both being wedge-base designs.
• The T5 and T10 designations refer to the bulb body width in eighths of an inch, placing the 74 at approximately 5/8 inch and the 194 at approximately 10/8 inch in body width, which accounts for their physical incompatibility.
• Both bulb types carry ANSI standardization recognized in the United States and Canada, indicating consistent availability across North American markets.
• The wattage difference between the two types, 1.4W for the 74 versus 3.78W for the 194, means substituting one for the other would alter the electrical load on the instrument panel circuit.