The Nissan 620 Pickup front turn signal requires a 1157 bulb size while the rear turn signal uses either a P21W or 1073 bulb size. The replacement chart covers 1972 to 1974 model 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 Nissan 620 Pickup front turn signal position uses the 1157 bulb across the 1972-1974 model years.
The 1157 is a dual-filament bulb operating at 12V with a 21W main filament and a 5W secondary filament, mounted on a BAY15d bayonet base under the ANSI standard used in the US and Canada.
The BAY15d base features two offset pins at different heights, which physically prevents single-filament bulbs from being seated in its place, making cross-substitution with single-filament types mechanically incompatible at the front turn signal position.
The rear turn signal position of the Nissan 620 Pickup does not share a single bulb type across all three model years, with the 1973 model year specifying the 1073 while the 1972 and 1974 model years specify the P21W.
The P21W is a single-filament bulb rated at 12V and 21W, built to the ECE standard and fitted with a BA15s bayonet base, which uses a single pin on each side at the same height.
The 1073 is also a single-filament bulb with a BA15s bayonet base, but it operates at a lower wattage of 13W compared to the P21W's 21W, classifying it as a lower wattage variant of the 1156 under the ANSI standard.
Although the P21W and 1073 share the same BA15s base type, their wattage ratings differ substantially, and substituting one for the other may affect turn signal flash rates or circuit compatibility depending on the vehicle's flasher relay design.