Mobility Ventures MV-1 Turn Signal Bulb Size

Additional Notes

• The 1157NA and 1034NA are the two bulb types specified for the Mobility Ventures MV-1 front turn signal across the 2014-2017 model years.
• Both the 1157NA and 1034NA are ANSI-standardized bulbs recognized in the United States and Canada, and both share the BAY15d bayonet base, a two-pin offset base design that locks the bulb into position with a twist.
• Both bulb types are dual-filament designs, meaning a single bulb serves two brightness levels, typically used for combined turn signal and parking light functions.
• Both types operate at 12 volts with a 21W/5W filament rating, where the higher wattage filament serves the active turn signal function and the lower wattage filament serves the running or parking light function.
• The natural amber glass of both bulb types produces the amber turn signal color directly from the glass rather than relying on a colored lens, which affects how the bulb appears when installed behind a clear housing.
• The 1034NA is described as a variant of the 1157NA, and while both share the BAY15d base and identical voltage and wattage ratings, they are distinct ANSI part numbers and are not specified as interchangeable across all model years of the MV-1.
• The 2015-2016 MV-1 front turn signal takes the 1034NA, while the 2014 and 2017 model years take the 1157NA, indicating that the same socket position across different production years may require different bulb part numbers.