Businesses in the engine electrical equipment trade supply, test, repair and recondition electrical components used to start and run engines. This commonly includes starter motors, alternators, generators, dynamos, ignition components, voltage regulators and associated wiring or fittings. Customers may include vehicle owners, garages, fleet operators and businesses maintaining agricultural, industrial or marine engines. Services can include diagnosing charging or starting faults, checking components on test equipment, replacing worn parts and fitting or rebuilding units. Suppliers may offer new, remanufactured or replacement equipment, together with advice on identifying compatible components from an engine or vehicle's specifications. Some businesses focus on particular types of engines or equipment, while others handle a broader range of automotive and commercial applications.