GM Full-Size Trucks 1980-1987 Repair Guide

Signal and Marker Lights

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REMOVAL & INSTALLATION



See Figures 1, 2, 3, 4 and 5

Front Parking/Turn Signal Lamp

For all trucks covered in this guide the front parking/turn signal lamps are replaced in 1 of 2 ways. For most applications, the lens must be removed in order to access the bulb. But on some applications the bulb is accessible from behind and lens removal is not required. Before using the lens removal methods listed below, look for access under the hood through openings in the front end/radiator support assembly. If no access to the bulb can be found, utilize the lens removal procedure.



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Fig. Fig. 1: Access to some front parking/turn signal lamps can be found from the rear



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Fig. Fig. 2: Turn the lamp socket, then withdraw the socket and lamp assembly from the lens

1980-85 BULB
  1. Remove lens retaining screws and remove lens from the housing.
  2.  
  3. Replace bulb and check lamp operation.
  4.  
  5. Install lens and retaining screws.
  6.  

1980-85 PARKING LAMP HOUSING
  1. Remove parking lamp lens screws and remove the lens.
  2.  
  3. Remove lamp housing retaining screws and pull housing forward.
  4.  
  5. Disconnect parking lamp wiring harness from housing by rotating bulb socket counterclockwise.
  6.  
  7. Connect wiring harness to new housing by inserting bulb socket into housing and rotation clockwise.
  8.  
  9. Install bulb if removed during disassembly. Install lens and retaining screws.
  10.  

1986-87 PARKING LAMP ASSEMBLY WITH TWO LAMP OPTION
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the four bezel retaining screws and remove the bezel.
  4.  
  5. Remove the three parking lamp retaining screws, disconnect the electrical connector and remove the parking lamp.
  6.  
  7. Reverse the above to replace.
  8.  

1986-87 PARKING LAMP ASSEMBLY WITH FOUR LAMP OPTION
  1. Remove the radiator grille.
  2.  
  3. Disconnect the electrical connector from the parking lamp assembly.
  4.  
  5. Remove the two nuts at the top of the housing and lift it up from the radiator grille.
  6.  
  7. Reverse the above to install.
  8.  



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Fig. Fig. 3: To remove a side marker lens, use a suitable screwdriver or Torx® driver to loosen the retaining screws



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Fig. Fig. 4: Carefully pull the assembly forward, then twist and remove the bulb socket from the rear of the lens



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Fig. Fig. 5: Remove the bulb from the bulb socket

Front Side Marker Lamp Bulb and/or Housing
1980-85
  1. For housing replacement follow procedure for the right side bulb replacement below.
    1. Left Side: Raise hood.
    2.  
    3. Right Side: Remove lamp assembly retaining screws and pull outward on assembly.
    4.  

  2.  
  3. Twist wiring harness socket 90 degrees counterclockwise and remove harness and bulb from housing.
  4.  
  5. Replace bulb and check lamp operation.
  6.  
  7. Insert bulb into housing, press in on harness socket and twist 90 degrees clockwise. Check that socket is securely attached.
  8.  
  9. Left Side: Lower hood.
  10.  
  11. Right Side: Install housing in opening and install retaining screws.
  12.  

1986-87
  1. Remove the two screws and remove the side marker lamp.
  2.  
  3. Remove the bulb from the lamp.
  4.  
  5. Reverse the above to install.
  6.  

Rear Side Marker Lamp Bulb and/or Housing
STEPSIDE MODELS

Same as Right Front Side Marker Lamp Bulb and/or Housing Replacement-All Vehicles.

FLEETSIDE MODELS
  1. Remove lens-to-housing four screws.
  2.  
  3. Replace bulb and check operation.
  4.  
  5. Position lens and install four attaching screws.
  6.  

Tail, Stop and Backup Lamp
BULBS

See Figures 6, 7 and 8

  1. Remove lens to housing attaching screws.
  2.  
  3. Replace bulb and check operation.
  4.  
  5. Position lens and install attaching screws.
  6.  



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Fig. Fig. 6: Remove the tail lens retaining screws



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Fig. Fig. 7: Remove the lens assembly for access to the tail lamps



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Fig. Fig. 8: Turn and remove the bulbs from the lamp sockets

TAIL, STOP AND BACKUP LAMP HOUSING

See Figures 9, 10 and 11

  1. Remove lens to housing attaching screws.
  2.  
  3. Remove bulbs from sockets.
  4.  
  5. Remove housing attaching screws.
  6.  
  7. Rotate wiring harness sockets counterclockwise and remove housing.
  8.  
  9. To install, reverse Steps 1-4 above.
  10.  



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Fig. Fig. 9: If the lamp housing must be removed or replaced, remove the lamp housing screws



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Fig. Fig. 10: Pull the lamp housing forward for access to the bulb sockets



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Fig. Fig. 11: Twist and remove the bulb sockets from the rear of the housing assembly

Directional Signal Lamps

Directional signal lamps are an integral part of parking and tail lamp assemblies. Refer to the applicable lamp or bulb replacement procedures covered previously.

Cab Roof Clearance Lamps
  1. Remove lens to housing attaching screws.
  2.  
  3. Remove bulbs from sockets
  4.  
  5. Rotate wiring harness sockets counterclockwise and remove housing.
  6.  
  7. To install, reverse Steps 1-3 above.
  8.  

Cargo Lamp
  1. Remove the lens screws.
  2.  
  3. Remove the lens.
  4.  
  5. Remove the bulb.
  6.  
  7. Installation is the reverse of removal.
  8.  

 
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