Car wiring diagram
Main components
* Battery
* Starter
* Generator
* Fuses
* Relay
* Switches
* Sensors
* ECU (Electronic Control Unit)
Connection diagram
1. Starting system
* Battery (-) to starter (-)
* Battery (+) to starter (+)
* Ignition switch to starter (S-contact)
* Ignition switch to ECU (IGN contact)
2. Charging system
* Generator (+) to battery (+)
* Generator (-) to battery (-)
* Generator (D+) to ECU (D-contact)
3. Lighting system
* Battery (+) to light switch
* Light switch to headlights
* Light switch to rear lights
* Light switch for direction indicators
4. Power system
* Battery (+) to ECU
* ECU to fuses and relays
* Fuses and relays for various electrical devices (eg stereo, air conditioning, power windows)
5. Engine control system
* ECU to sensors (for example, lambda probes, crankshaft and camshaft position sensors)
* ECU for injectors and ignition coils
* ECU to actuators (eg throttle valve, EGR valve)
6. Security system
* Battery (+) to horn
* Battery (+) to central locking
* Battery (+) to the anti-theft system
Note: Actual wiring diagram may vary depending on vehicle. Always refer to the wiring diagram for your specific vehicle before performing any electrical work.