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CONTENTS - TM-5-4210-230-14P-1_586
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SEALED BEAM UNIT REPLACEMENT
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 ELECTRICAL INTRODUCTION Outlined below are service procedures covering lights used  on  typical  S-Series  vehicles.    Some  vehicles  may  be equipped    with    additional    accessory    lights    which    are    not covered herein. When    diagnosing    light    failure,    first    check    for    a "blown"   fuse   or   tripped   circuit   breaker.      Fuse   sizes   and locations are listed in the circuit diagram section of the Truck Service Manual Refer to the appropriate section covering the model year of the vehicle being serviced.  If a "blown" fuse or tripped circuit breaker is found, inspect wiring circuit for cause of overload and make necessary repairs. If  fuse  or  circuit  breaker  is  satisfactory,  check  for "burned  out"  light  bulb  and  replace  if  necessary.    Light  bulb types  used  in  various  lights  are  listed  in  the  LIGHT  BULB CHART in this section. If light bulb is good, check wiring and connectors for an  "open"  circuit.    A  12-volt  test  light  can  be  used  to  check circuit   continuity.      Refer   to   the   appropriate   wiring   circuit diagram. HEADLIGHTS HEADLIGHT AIMING Various   types   of   headlight   aiming   equipment   are available    commercially.        When    using    aiming    equipment, follow instructions provided by the equipment manufacturer. Where  headlight  aiming  equipment  is  not  available, headlight   aiming   can   be   checked   by   projecting   the   upper beam  of  each  light  upon  a  screen  or  chart  at  a  distance  of about  25  feet  ahead  of  the  headlights.    The  truck  should  be exactly perpendicular to the chart. Fig.  1  Headlight Aiming Pattern The  vertical  lines  on  the  chart  (Figure  1)  mark  the distance  between  the  vertical  center  lines  of  the  headlights and are equally spaced from the center line of the chart. A  horizontal  line  should  be  placed  on  the  chart  at  a level   of   two   (2)   inches   below   the   height   of   the   headlight centers above the floor. With  headlights  on  "HIGH"  beam,  the  "hot  spot"  of each   projected   beam   pattern   should   be   centered   over   the point of intersection of the vertical and horizontal lines on the chart, as shown in Figure 1. If    necessary,    adjust    headlights    vertically    and/or laterally to obtain proper aim. (See HEADLIGHT ADJUSTMENT). IMPORTANT Headlight aim should always be checked on a level floor with the vehicle unloaded. In  some  states,  the  above  instructions  may conflict   with   existing   laws   and   regulations. Where   this   is   the   case,   legal   requirements must be met. Modify the instructions accordingly. HEADLIGHT ADJUSTMENT Adjusting     screws     are     provided     to     move     the     headlight assembly  in  relation  to  the  hood  (fender)  to  obtain  correct headlight aim. Lateral or side-to-side adjustment is accomplished by turning adjusting screw at side of headlight (Figure 2). Vertical    or    up-and-down    adjustment    is    accomplished    by turning adjusting screw at top of headlight (Figure 2). Fig.  2  Headlight Adjusting Screws CTS-2781S Page 3 PRINTED IN UNITED STATES OF AMERICA

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