1987-1990 Chevrolet Caprice Headlight Guide: Composite Housings & Dim Light Fixes

Headlight Variants: Composite vs. Sealed Beam

For the 1987-1990 model years, the Chevrolet Caprice could be equipped with two different types of headlights. It is critical to identify which type your vehicle has before purchasing a replacement.

• Composite Headlights: These are the most common type for this era. They feature a plastic or glass lens as part of a larger assembly and use replaceable halogen bulbs (typically a 9006 for the low beam and a 9005 for the high beam). The entire front end of the car has a smoother, more integrated look. This guide focuses on these composite assemblies.
• Sealed Beam Headlights: Some base models may have retained the older sealed beam style. These are all-in-one glass units where the bulb filament is built into the lamp. When the bulb burns out, the entire rectangular glass unit must be replaced. They are not interchangeable with composite assemblies without changing the header panel and wiring.

Symptoms of a Failing Headlight Assembly

Failure can be due to the assembly itself, the bulb, or the vehicle's wiring. Here are the most common symptoms:

• Dim or Flickering Lights: While this can be a failing bulb or alternator, on these specific GM vehicles, it is very commonly caused by a poor ground connection near the headlight assembly. The wiring harness ground point can corrode over time, creating resistance and preventing the bulb from receiving full power.
• Moisture or Condensation Inside the Lens: The seal between the lens and the housing can fail with age. This allows water to enter, which can cause the reflective chrome surface to peel, short out bulb connections, and significantly reduce light output.
• Yellowed or Hazy Lens (UV Damage): The plastic lenses on composite headlights are exposed to the sun's UV rays, which causes them to yellow and become cloudy over time. This oxidation reduces the amount of light that can pass through, making your headlights appear dim even with new bulbs.
• Cracked Lens or Housing: Physical damage from road debris, parking lot bumps, or minor accidents can crack the lens or break the housing, allowing moisture in and compromising the assembly's structural integrity.
• One Beam Works, The Other Doesn't: Since these assemblies use separate bulbs for high and low beams, it's common for one to burn out while the other still functions. This indicates a simple bulb replacement is needed, not necessarily a full assembly replacement.

Buying a Used Headlight Assembly: What to Inspect

A used OEM headlight assembly is often a better choice than a cheap aftermarket one due to superior materials and fitment. However, you must inspect it carefully.

1. Check All Mounting Tabs: This is the most critical inspection point. The assembly attaches to the car with three studs. Ensure the plastic mounting points on the housing where these studs are located are not cracked, broken, or repaired with glue. A broken tab means the headlight cannot be securely mounted or aimed correctly.
2. Inspect the Lens Condition: Look for deep cracks, heavy sand-pitting, and severe yellowing. Minor hazing can often be polished out with a restoration kit, but a deeply yellowed or cracked lens means the assembly should be rejected.
3. Look for Signs of Moisture: Check for a 'water line' or flaking chrome on the reflector inside the housing. This is a clear sign the seal has failed and the assembly will likely fog up in the future.
4. Verify Compatibility: Ensure you are buying the correct side (driver or passenger) and that it is for the composite style, not the sealed beam style. The part numbers 16513075 for the left (driver) side and 16513076 for the right (passenger) side are common for these assemblies.
5. Check the Bulb Sockets: Look at the electrical connector sockets on the back. They should be free of corrosion, melting, or brittleness. Damaged sockets can cause intermittent light function.

Known Issues, Recalls, and Technical Service Bulletins (TSBs)

For a vehicle of this age, most issues are related to wear and tear rather than manufacturing defects.

• Poor Ground Connection: The most widely reported electrical issue for dim or non-functional headlights on this generation of Caprice is a bad ground. Before replacing an entire assembly for dimness, locate the black ground wire coming from the headlight harness, and ensure it is securely attached to a clean, paint-free spot on the chassis or radiator support. Often, simply cleaning the connection point and re-securing the wire will restore brightness.
• No Major Recalls: There are no major, widespread NHTSA recalls specifically for the headlight assemblies on the 1987-1990 Chevrolet Caprice. Later model GM vehicles had significant recalls for failing Headlamp Driver Modules (HDMs), but these older Caprices use a much simpler system without these components.

Replacement and Alignment Guide

Replacing the headlight assembly is a straightforward DIY job that requires basic hand tools.

Difficulty: 2/5
Estimated Time: 0.5 - 1 hour per side

Tools Needed:

• Ratchet with extensions
• 11mm socket
• Phillips screwdriver (for aiming)

Removal Steps:

1. Open the Hood: Secure the hood in the open position. For the passenger side assembly, you will likely need to remove the battery to gain access to the rear nuts.
2. Locate the Mounting Nuts: Look at the radiator core support behind the headlight assembly. You will see three studs protruding through tear-drop shaped holes. There are three 11mm nuts that secure the assembly.
3. Remove the Nuts: Using a ratchet, extension, and 11mm socket, remove the three nuts. Be careful not to drop them into the engine bay.
4. Disconnect Wiring: Once the nuts are off, gently pull the assembly forward. Reach behind it and twist to remove the high beam and low beam bulb sockets from the back of the housing.
5. Remove the Assembly: The headlight assembly can now be fully removed from the vehicle.

Installation and Aiming:

Installation is the reverse of removal. Once the new assembly is installed, the headlights must be aimed to ensure they illuminate the road correctly without blinding other drivers.

1. Park the car on a level surface about 25 feet away from a flat, vertical wall (like a garage door).
2. Turn on the low beams. You will see two distinct hotspots on the wall.
3. Locate the adjustment screws on the top and side of the headlight assembly. These are typically Phillips or Torx head screws. One adjusts vertical aim (up/down) and the other adjusts horizontal aim (left/right).
4. Adjust the screws so that the most intense part of the beam is slightly below the height of the center of the headlight lens and aimed straight ahead. The driver's side beam should be aimed straight, while the passenger's side can be aimed slightly to the right to illuminate the shoulder of the road.

Cost Comparison

Frequently Asked Questions (FAQ)