Measure velocity, horsepower, revolutions per minute (rpm), amperage, circuitry, and voltage of units or parts to diagnose problems, using ammeters, voltmeters, wattmeters, and other testing devices. Record repairs required, parts used, and labor time. Reassemble repaired electric motors to specified requirements and ratings, using hand tools and electrical meters. Maintain stocks of parts. Repair and rebuild defective mechanical parts in electric motors, generators, and related equipment, using hand tools and power tools. Rewire electrical systems, and repair or replace electrical accessories. Inspect electrical connections, wiring, relays, charging resistance boxes, and storage batteries, following wiring diagrams. Read service guides to find information needed to perform repairs. Inspect and test equipment to locate damage or worn parts and diagnose malfunctions, or read work orders or schematic drawings to determine required repairs. Solder, wrap, and coat wires to ensure proper insulation. Assemble electrical parts such as alternators, generators, starting devices, and switches, following schematic drawings and using hand, machine, and power tools. Lubricate moving parts. Remove and replace defective parts such as coil leads, carbon brushes, and wires, using soldering equipment. Disassemble defective equipment so that repairs can be made, using hand tools. Lift units or parts such as motors or generators, using cranes or chain hoists, or signal crane operators to lift heavy parts or subassemblies. Weld, braze, or solder electrical connections. Reface, ream, and polish commutators and machine parts to specified tolerances, using machine tools. Adjust working parts, such as fan belts, contacts, and springs, using hand tools and gauges. Clean cells, cell assemblies, glassware, leads, electrical connections, and battery poles, using scrapers, steam, water, emery cloths, power grinders, or acid. Scrape and clean units or parts, using cleaning solvents and equipment such as buffing wheels.