The Pontiac J2000 front turn signal requires a 2057NA or 1034NA bulb size, while the rear turn signal uses a 2057 or P21W bulb size. The replacement chart covers 1982 to 1983 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 2057NA is a dual-filament bulb operating at 12V with a high/low wattage of 26.9W/8W. It uses a BAY15d bayonet base and features natural amber glass, which produces the amber signal color without the need for a tinted lens.
The 1034NA shares the same BAY15d bayonet base as the 2057NA but draws less power, rated at 21W/5W. Both are ANSI-standard bulbs intended for the US and Canadian markets.
The 2057 is the clear-glass counterpart to the 2057NA, carrying identical wattage ratings of 26.9W/8W at 12V with the same BAY15d base. The absence of amber glass means the signal color is typically provided by the lens housing rather than the bulb itself.
The P21W follows the ECE standard used in Europe and worldwide markets, rather than the ANSI standard. It uses a BA15s single-pin bayonet base, which is not interchangeable with the BAY15d double-pin base found on the 2057NA, 1034NA, and 2057 bulbs.
For the Pontiac J2000, the front and rear turn signal bulbs differ between the 1982 and 1983 model years. The 1983 model uses a 2057NA at the front and a 2057 at the rear, while the 1982 model uses a 1034NA at the front and a P21W at the rear.
The BAY15d base is a dual-contact bayonet fitting that supports two separate filaments within one bulb, allowing a single unit to serve both turn signal and parking light functions. The BA15s base on the P21W is a single-contact fitting and supports only one filament.
The 2057NA and 2057 share the same wattage output and base type, differing only in glass color. Substituting one for the other affects whether the amber signal color is produced by the bulb or the lens.
The 1034NA used in the 1982 front turn signal position draws a lower wattage than the 2057NA used in the 1983 position. Substituting a 2057NA in a circuit calibrated for the 1034NA may affect the behavior of load-sensitive turn signal flasher units.
The P21W used in the 1982 rear turn signal position is a single-filament bulb, meaning it serves only one lighting function per socket, unlike the dual-filament bulbs used in the other positions across both model years.