An auto electrician is a tradesman specializing in electrical wiring of vehicles Auto electricians may be employees in the installation of new electrical components or the maintenance and repair of existing electrical components Auto electricians specialize in cars and commercial vehicles Auto electricians are able to diagnose the electrical problems in a car and fix them by either rewiring the faulty parts or replacing them altogether so that the vehicle runs properly The electrical parts in a car include the alternator, headlight, starter motor and a circuit board An auto electrician is also able to install or fix car alarm systems, audio and entertainment units, phones and communication gadgets such as a navigation systems.