Renault LeCar front and rear turn signal bulbs utilize 1073, P21W, and 1157 bulb sizes for optimal lighting function. The replacement chart covers 1977 through 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 1157 bulb is the most consistently used type across the Renault LeCar's turn signal specifications, appearing in both front and rear positions for the 1977-1979 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, which is an offset twin-contact base that prevents incorrect insertion.
The P21W is a single-filament ECE-standard bulb rated at 12V and 21W, using a BA15s bayonet base, and it serves as the rear turn signal bulb for the Renault LeCar across the 1980-1983 model years.
The 1073 is a single-filament ANSI-standard bulb rated at 12V and 13W, also using a BA15s bayonet base, and it is specified for the front turn signal on the 1980 and 1983 LeCar.
Although the 1073 and P21W share the same BA15s bayonet base type, their wattage ratings differ significantly, at 13W and 21W respectively, which makes them non-interchangeable despite the physical base compatibility.
The BAY15d base of the 1157 and the BA15s base of the 1073 and P21W are physically distinct, as the BAY15d features offset pins to accommodate dual-filament orientation, making cross-substitution between these bulb families impossible without socket modification.
The front turn signal of the Renault LeCar uses three different bulb types across its production span, with the 1157 for 1977-1979, the 1073 for 1980, P21W for 1981-1982, and the 1073 again for 1983.
The rear turn signal specification is split into two distinct phases: the 1157 for 1977-1979 and the P21W for 1980-1983, with no variation within each phase.
The 1073 is described as a lower wattage variant of the 1156, meaning it shares the same BA15s single-contact base but draws less power, a distinction relevant when evaluating socket and relay compatibility.
The shift from the dual-filament 1157 to single-filament bulbs in both front and rear positions after 1979 represents a change in filament configuration, as the 1157 carries a secondary 5W filament not present in either the 1073 or P21W.