The Volvo 760 front turn signal uses 1157NA, 1034NA, or P21/5W bulb sizes, while the rear turn signal requires P21/5W or P21W bulb sizes. The replacement chart covers 1983 to 1990 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Volvo 760 front turn signal uses four distinct bulb types across its 1983-1990 production span: P21W, P21/5W, 1034NA, and 1157NA.
The BAY15d bayonet base is shared by three of the four bulb types specified for the Volvo 760: the 1157NA, 1034NA, and P21/5W. The P21W uses a BA15s bayonet base instead, which is a single-contact fitting incompatible with the dual-contact BAY15d socket.
The P21W is a single-filament bulb rated at 12V and 21W, while the P21/5W, 1157NA, and 1034NA are all dual-filament bulbs rated at 12V with a 21W/5W output split, meaning the lower 5W filament serves a secondary function such as a position or parking light.
The 1034NA is an ANSI-standard variant of the 1157NA, sharing the same BAY15d base, 12V operating voltage, and 21W/5W dual-filament configuration. Both types feature natural amber glass, which produces the amber signal color without requiring an amber-tinted lens.
The P21/5W follows the ECE regulatory standard used in Europe and worldwide markets, whereas the 1157NA and 1034NA follow the ANSI standard applied in the United States and Canada. Despite sharing the BAY15d base and identical wattage ratings, these standards are not interchangeable designations.
The front turn signal of the Volvo 760 transitioned from P21W in 1983-1984 to P21/5W in 1985-1987, then shifted to ANSI-standard bulbs with the 1034NA in 1988-1989 and the 1157NA in 1990.
The rear turn signal of the Volvo 760 used the P21W from 1983-1987 and then switched to the P21/5W for 1988-1990, a change that also involved a base type change from BA15s to BAY15d.
In 1987, the Volvo 760 front and rear turn signals required different bulb types simultaneously, with the front position calling for P21/5W and the rear position calling for P21W. These two bulbs are not interchangeable due to differing base types and filament configurations.
By 1990, the front turn signal specification of the Volvo 760 had moved exclusively to the 1157NA, an ANSI-standard bulb, while the rear turn signal retained the ECE-standard P21/5W, resulting in two different regulatory-standard bulbs being used on the same model year vehicle.
The natural amber glass of the 1034NA and 1157NA bulbs is a defining characteristic of ANSI-standard turn signal bulbs, distinguishing them visually from the clear-glass P21/5W, which relies on an external amber lens to produce the required signal color.