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Comprehensive Guide to Automotive Lighting Circuits and Bulb Designs

This guide covers essential aspects of automotive lighting circuits, including various bulb types such as miniature bayonet, single and double contact bayonet bulbs, and cartridge types for dome lights. It details headlight specifications, including sealed beams, halogen, and composite headlights, along with switch types and cornering light functions. Learn about parking, tail, and brake light systems, including federal mandates on bulb colors and designs. This resource is invaluable for technicians and automotive enthusiasts seeking to understand vehicle lighting technology.

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Comprehensive Guide to Automotive Lighting Circuits and Bulb Designs

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  1. LIGHTING CIRCUITS

  2. LAMPS • Numbering System (C252) • A & B - Miniature bayonet/instrument/indicator • C - Single contact bayonet/lic and courtesy • D - Double contact bayonet/trunk/underhood • F - Cartridge type for dome lights • G - Wedge base/instrument • D - Double contact bayonet/trunk/underhood Bulbs Page L300 & C252

  3. CONTACT DESIGN • Single filament, single contact • Single filament, dual contact • Dual Filament, dual contact • Even Prongs • Offset Prongs

  4. Sockets must be clean and tight Page Lab 328

  5. HEADLIGHTS • Sealed Beam • Halogen • Composite Headlights • Vented Housing • Causes Condensation • Concealed Headlights • Vacuum controlled • Electrically controlled Pg C256

  6. SEALED BEAMS Pg C255

  7. Beam reflects

  8. Pg L309

  9. Adjustment mount pads Pg L309

  10. Adjustment Pg L309

  11. HALOGEN HEADLIGHT • Sealed Housing • Grommet Seal • Twist to Lock • 25% brighter • life Span • Cleanliness when replacing Pg L306

  12. HEADLIGHT SWITCHES • Headlight Switches • Dash Mounted • Multi-function Switch • Dimmer Switches • Headlight Circuits • Flash to Pass • Continuity Chart • Concealed Headlights Pg L312 & C259

  13. CORNERING LIGHTS • Turn Signal Activated • All the time • Night time only (Parklights on) • Turn signal has additional set of contacts • Burn steady whenever turn signals are used C281 to C 284

  14. TURN SIGNALCIRCUITS

  15. TURN SIGNAL SWITCHNeutral C277 to C281 Stop Switch Left Rear Turn Right Rear Turn Left front Light & Indicator Right front T-Sig Flasher Light & Indicator

  16. RIGHT TURN Stop Sw. Left Rear Turn Right Rear Turn Front Left Turn & Ind. T-Sig Flasher Front Right Turn&Ind

  17. LEFT TURN Stop Sw Right Rear Turn Left Turn Rear Front Left Turn & Ind T-Sig Flasher Front Right Turn&Ind

  18. PARKING AND TAILLIGHTS • Two Bulb System • Dual filament • Three Bulb System • 1 bulb for each function • Bulb color is federally mandated C270

  19. BRAKE LIGHTS • Two Bulb System • Three Bulb System • Center Mounted High Stop Lamp

  20. C275 TWO BULB BRAKE SYSTEM

  21. THREE BULB SYSTEM C275

  22. CENTER MOUNTED HIGH STOP LIGHT (CHMSL) C276

  23. C284 BACK UP LIGHTS

  24. C286 SIDE MARKER AND CLEARANCE LIGHTS • Federal Requirement since 1969 • Front - Amber • Rear - Red • On Steady • Flash with Turn Signal

  25. Turn Signal on/Parking Light On • Wired parallel with with parking lights. • high resistance side marker light bulb • ground through turn signal filament • turn signal filament less resistance than side marker filament C287

  26. Parking lights off/turn signal on • Marker light receives power from turn signal switch • Ground for side marker through park light filament • Side Marker will flash with turn signal light

  27. Turn Signal On/Park Lights On • Voltage equal to both sides of Marker Light • Flasher turns off Turn Signal Light then Turn filament is ground for Marker Light • Will Stay on until Flasher Turns Signal Light on again

  28. INTERIOR LIGHTS • COURTESY LIGHTS • INSTRUMENT CLUSTER AND PANEL LIGHTS • DOME LIGHTS • OPERA LIGHTS • WARNING LIGHTS • MAP LIGHTS C288

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