AUTOMATIC HEADLIGHTS (ON/OFF WITH DELAY)

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AUTOMATIC HEADLIGHTS(ON/OFF WITH DELAY)

• CHAPTER 13
• CLASSROOM 408 TO 411
• LAB 458 TO 465

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SYSTEM OPERATION

• ALLOWS HEADLIGHTS TO AUTOMATICALLY TURN ON WHEN
  AMBIENT LIGHT DECREASES
• ALLOW LIGHTS TO STAY ON AFTER KEY OFF POSITION
  FOR PREDETERMINED TIME
• CAN BE INTERGRATED WITH OTHER LIGHTING SYSTEMS
  ALSO

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COMPONENTS

• PHOTOCELL
• AMPLFIER
• POWER RELAY
• TIMER CONTROL
• HEADLIGHT SWITCH
• HEADLIGHT BULBS

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PHOTOCELLAMPLIFIER

• Senses outside light
• Internal resistance increases with less light.
• When resistance value reaches predetermined
  value, lights go on.
• Triggers autolamp relay
• Point of turn on is adjustable

CLASS 408
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PHOTOCELL REPLACEMENT
L461

• Usually located on top of dash.
• Usually built into amplifier assembly on Ford
  products
• Cleanliness is important to interior work

See Photo Sequence 14
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POWER RELAY

• Provides Power to Headlights in Auto mode.
• Can test like any relay

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TIMER CONTROL
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HEADLIGHT SWITCH
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PHOTOCELL TEST

• Can make a tool to test Photocell. See Page 463
  in Lab
• Tool substitutes for photocell

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