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The Electrical System:
Turn signals
 The turn signal switch is responsible for closing the electrical circuit that allows an electrical current to flow to the signal indicator lights. As the bulbs receive current, its filament or element becomes hot and begins to glow, producing light. A flasher unit opens and closes the circuit to the light causing light to flash on and off.
The signal flasher operates by quickly opening and closing the electrical circuit to the signal bulb, causing it to flash. The flasher unit contains a temperature sensitive metallic strip and a heating element. The metallic strip is connected to contact points and a fuse.  When electrical current flows through the turn signal flasher, the metallic strip becomes heated and curls up, breaking the electric circuit and turning off the flasher.
A simplified flasher unit
The metallic strip cools very rapidly, causing the strip to straighten out and reconnecting the circuit. This cycle repeats about once per second. Signal flashers are very sensitive to the amount of electrical current flowing through them. If you increase the amount of electricity, the flasher unit will tend to flash more quickly. If you reduce the electrical current the flasher will flash slower or not at all.
Hazard Lights
The emergency flasher operates by quickly opening and closing the electrical circuit to the signal bulb, causing it to flash. The flasher unit contains a temperature sensitive metallic strip and a heating element. |
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1. Electrical System
2. The Battery
3. The Starter
4. The Alternator
5. The Voltage Regulator
6. Lighting
7. Lighting System Basics
8. Interior Lights
9. Voltage
11. The Horn
12. Windshield Wipers
13. The Defroster
14. Electrical Symbols
15. Types Of Electrical Circuits
16. Electrical Circuit Defects
17. Introduction To Automotive Batteries
18. Battery Construction
19. Battery Operation
20. Specific Gravity
21. Voltage And Capacity
22. Battery Ratings
23. Testing Automotive Batteries
24. Preventive Maintenance Of Batteries
25. Optical Battery & Antifreeze Tester
26. Measuring Specific Gravity With The Optical Battery Tester
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