An auto electrician runs tests on complex computer systems in vehicles and conducts repairs on those systems including rewiring, component replacement including alternators, starters and the like. An auto electrician is certified to work specifically on automotive systems  which are DC circuits and does not need to operate under the AUS/NZ2018 wiring rules. Electricians on the other hand specialise in AC electrical systems including the repair and maintenance of those systems where the voltages can be lethal