Here’s an in-depth look inside a car’s electrical system and how it works. To break down this complex topic, this video will cover 6 main topics:
1:05 Power Distribution
5:43 Wiring Harness
8:49 Connectors
12:21 Electrical Modules
15:25 Wiring Diagram
20:22 CANBus Communication
The electrical system in a car is responsible for controlling and distributing electricity from the car’s battery and alternator to each component in the vehicle. Current begins its journey at the battery (and then the alternator if the engine is running), and makes its way to the intelligent power distribution module, which contains circuit breakers, fuses and relays. Current is then split off into various circuits through the wiring harness, which will feed electrical loads, such as modules, computers, light bulbs and motors.
To connect the various electronic devices in a modern vehicle, a network of communication, called CANBus is used. It significantly reduces the number of wires travelling throughout a car, enables easier communication between computer modules and aids with advanced diagnostics.
Also discussed is how to properly diagnose an electrical issue in your car, properly fix a broken wire and de-pin an electrical connector.
The majority of components in this video were from a 2004 Infiniti G35’s electrical system.
Wiring diagrams can be found here:
http://mr2.phpwerx.net/manuals/
https://www.nicoclub.com/infiniti-service-manuals
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