What type of information does an electrical wiring diagram provide?

• A. A list of approved replacement parts
• B. Maintenance intervals and procedures
• C. Circuit connections, wire colors, locations, and components
• D. Firmware versions of avionics

Answer: (C)

Electrical wiring diagrams show how the electrical system is actually wired, including the exact circuit connections, wire colors, routing locations, and the components involved such as switches, relays, fuses, and connectors. This information lets you trace a circuit, confirm proper wiring, and understand how power flows through the system during installation, testing, or troubleshooting. It isn’t used to list approved replacement parts, which you’d find in the parts catalog; it doesn’t specify maintenance intervals or procedures, which are in the maintenance manual; and it doesn’t indicate firmware versions, which relate to software in avionics.