GM Full-Size Trucks 1980-1987 Repair Guide

Headlights

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REMOVAL & INSTALLATION



See Figures 1, 2, 3, 4, 5 and 6

  1. Remove the headlight bezel.
  2.  
  3. Remove the retaining ring screws and the retaining ring. Do not disturb the adjusting screws.
  4.  
  5. Unplug the headlight from the electrical connector and remove it.
  6.  
  7. Installation is the reverse of removal.
  8.  

The number molded into the lens face must be at the top.



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Fig. Fig. 1: Use a Torx® head driver to remove the upper bezel retaining screws



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Fig. Fig. 2: Remove the lower bezel retaining screws



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Fig. Fig. 3: With the screws removed, lift the bezel from the vehicle



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Fig. Fig. 4: Remove only the headlight retaining ring screws which are threaded through the ring flange



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Fig. Fig. 5: Remove the retaining ring and pull the headlight forward slightly to access the wiring harness



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Fig. Fig. 6: Disengage the wiring harness connector from the rear of the headlight assembly

HEADLIGHT AIMING



See Figures 7 and 8

The headlights must be properly aimed to provide the adequate road illumination. The lights should be checked for proper aim, and adjusted if necessary, after installing a new sealed beam unit or if the front end sheet metal has been replaced. Certain state and local authorities have requirements for headlight aiming and you should check these before adjusting.

The truck's fuel tank should be about half full when adjusting the headlights. Tires should be properly inflated, and if a heavy load is carried in the pick-up bed, it should remain there.

Horizontal and vertical aiming of each sealed beam unit is provided by two adjusting screws, which move the mounting ring in the body against the tension of the coil spring. There is no adjustment for focus; this is done during headlight manufacturing.



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Fig. Fig. 7: Headlight adjustment slots, earlier models



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Fig. Fig. 8: Headlight aiming. Round headlight models similar

 
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