Automotive electricians work with computer-controlled engine management and other systems. They service, identify and repair faults on electronically controlled vehicle systems such as electronic fuel injection, electronic ignition, anti-lock braking, cruise control, automatic transmission, air bags and air-conditioning. Part of their duties is to install electrical equipment such as gauges, lighting, alternators and starter motors in vehicles as well as install electrically operated accessories such as radios, heating or demisting equipment, air-conditioners, driving lamps and anti-theft systems. They use meters, test instruments and circuit diagrams to find electrical faults. Automotive electricians also adjust engine control systems and timing to make sure vehicles are running at peak performance. They can also test, recondition and replace faulty alternators, generators, starter motors and related items such as voltage regulators and batteries and repair or replace faulty ignition, electrical wiring, fuses, lamps and switches. They use hand tools, specialised electrical tools and instruments and machines, including drills, grinders, presses and lathes. They can also solder or weld when repairing electrical parts. Automotive electricians sometimes sell and install electrical parts and accessories and install, repair and service air-conditioning systems.