Chevrolet Biscayne Ignition Bulb Size

Additional Notes

• The 1895 bulb is a T5 miniature wedge type operating at 12V and 0.9W. The wedge base design means the bulb is held in place by tension from the socket itself, with no separate metal base or pins required for retention.
• The 1445 and 53 bulbs both use a BA9s bayonet base and share identical electrical ratings of 12V and 2W, making them functionally interchangeable in terms of power draw and base fitment.
• Despite the shared electrical and base specifications between the 1445 and 53, they carry distinct ANSI designations, which can indicate differences in physical envelope size or other dimensional characteristics that may affect fitment in specific sockets.
• The Chevrolet Biscayne used bulb 53 for the ignition position across the 1958-1963 model years, representing the longest continuous use of a single bulb type in this specification set.
• The 1964-1967 model years specify the 1445 bulb, which shares the BA9s base with the 53 but is a separate ANSI designation. Substituting one for the other without confirming socket clearance could result in fitment issues.
• The 1968 model year specifies the 1895 wedge bulb, which is electrically distinct from both the 1445 and 53 at 0.9W versus 2W. Its wedge base is physically incompatible with the BA9s sockets used in earlier model years.
• All three bulb types across the full specification range are ANSI-standardized for the US and Canadian markets and operate on 12V electrical systems.