This International Standard applies to vehicles with internal combustion engines, equipped with lead acid batteries and their trailers, as defined in 3.1 and 3.2 of is 38332) (motorcycles excluded). The values appearing in the tables in Chapter 6 only concern new vehicles.
NBN R 01-016-1979 history
1979NBN R 01-016-1979 Road vehicles - Working voltages for lights fitted to motor vehicles and to their trailers