Chevrolet Biscayne Ignition Light Bulb Size

Additional Notes

• The ignition light bulb specifications for the Chevrolet Biscayne span model years 1958-1968, covering three distinct bulb types across that period: the 53, the 1445, and the 1895.
• The bulb 53 and the bulb 1445 share identical electrical ratings of 12V and 2W, and both use a BA9s bayonet base with a single filament. Despite these similarities, they are separate ANSI-designated part numbers and are not listed as interchangeable within these specifications.
• The BA9s base is a small bayonet-style cap with a 9mm base width, commonly associated with miniature indicator and instrument panel bulbs in automotive applications.
• The 1895 bulb, specified for the 1968 Biscayne, is a T5 miniature wedge type rated at 12V and 0.9W. The wedge base design requires no separate metal cap, as the glass envelope itself is pinched to form the retaining connection.
• At 0.9W, the 1895 draws notably less power than the 2W rating of the 53 and 1445 bulbs, reflecting a difference in construction type rather than a direct substitution relationship.
• The bulb 53 was the specified ignition light for the Chevrolet Biscayne across model years 1958-1963, representing the longest continuous use of a single bulb type within these specifications.
• The 1445 replaced the 53 starting with the 1964 model year and remained the specified bulb through 1967, covering model years 1964-1967.
• All three bulb types carry ANSI standardization applicable to both the United States and Canada, indicating conformance to a shared North American specification framework.