Both #Volkswagen and #Opel / #Vauxhall use convention of #brown wire for an earth/ground (and in the case of this Corsa a black wire for L+), but in modern #ElectricalEngineering a brown wire is treated as live (could be either AC or DC) and black is often L- on older systems (nowadays blue or grey is preferred depending on whether the DC is negative or positive earthed).
I assume these conventions for #cars started long before the standardised European colours for electrical wiring in buildings and other equipment
Which you have to beware of if you often switch between #CarMaintenance and general electric work!

























