1. PIMPRI CHINCHWAD POLYTECHNIC
PROGRAM: MECHANICAL ENGINEERING COURSE: AUTOMOBILE (17526)

2. 5.Eletrical systems.
CO501.1: Identify various components of Automobile. C501.4 : Describe battery constructional details, charging system, starting system, lighting system.

3. Electrical Systems

4. Function of battery:
Battery supplies the current for cranking motor and ignition system when the engine is being cranked for starting.
When the vehicle is stationary battery supplies electricity for operating the various electrical devices.

5. Construction:
Battery consists of – Container, Positive and negative plates, Separators, Cell cover, Electrolyte, Grids, Cell connectors, Taper terminals, sealing compounds etc.
Positive and negative plates are arranged alternately and separated by separators.
Negative plates are surrounded by spongy lead paste and positive plates are surrounded by lead peroxide.
The entire container of battery is filled with an electrolyte.
All positive plates are connected to positive terminal and all negative plates are connected to negative terminal.

6. Battery……

7. Battery Testing Specific Gravity Test Open Volt Test High charge Test
Cadmium test

8. Battery Rating
Twenty Hour test
Cold rating
Twenty five ampere rate

9. Battery Ignition System

10. Magneto Ignition System

11. Magneto Ignition System

12. Electronic Ignition System
Transistor Assisted contact system

13. Capacity Discharge Ignition System

14. Starting System

15. Bendix drive

16. Alternator

17. Wiring System Colour codes used in wiring system:
Brown: Battery & Generator circuit
Yellow: Overdrive circuit
White: Ignition circuit
Green: Auxiliary circuit fed through ignition switch
Blue: Head lamp circuit
Red: Side and Tail lamp circuit
Black: Earth circuits

18. Wiring Diagram