1157 is a dual filament 12 volt bulb. 1154 would be a 6 volt bulb. Maybe a PO started the 12v conversion already.

Last edited by Phak1; 02/04/2023 1:34 PM.

Phil
Moderator, The Engine Shop, Interiors and Project Journals

1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube
Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes
Project Journals
Stovebolt Gallery Forum