AUTOMATIC HEADLIGHTSAUTOMATIC HEADLIGHTS(ON/OFF WITH DELAY)(ON/OFF WITH DELAY)

CHAPTER 13CLASSROOM 408 TO 411

LAB 458 TO 465

SYSTEM OPERATIONSYSTEM 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

COMPONENTSCOMPONENTS

PHOTOCELL AMPLFIER POWER RELAY TIMER CONTROL HEADLIGHT SWITCH HEADLIGHT BULBS

PHOTOCELLPHOTOCELLAMPLIFIERAMPLIFIER

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

PHOTOCELL PHOTOCELL REPLACEMENTREPLACEMENT

Usually located on top of dash.

Usually built into amplifier assembly on Ford products

Cleanliness is important to interior work

L461

See Photo Sequence # 14

POWER RELAYPOWER RELAY

Provides Power to Headlights in Auto mode.

Can test like any relay

TIMER CONTROLTIMER CONTROL

HEADLIGHT SWITCHHEADLIGHT SWITCH

PHOTOCELL TESTPHOTOCELL TEST

Can make a tool to test Photocell. See Page 463 in Lab

Tool substitutes for photocell