1984-1987 Buick Regal Tail Lamp: Chrome vs. Black Trim and Fitment Guide
This guide covers the critical differences between tail lamp assemblies for the Buick Regal, Grand National, and T-Type, focusing on common failures and how to buy a good used part.
- These tail lamps fit 1984-1987 Buick Regal 2-door coupes ONLY; they do not fit 4-door sedans.
- Verify the bezel color before buying: chrome was for standard Regals, while black was for Grand National and T-Type models.
- Dim or flickering lights are a common problem, usually caused by a bad ground connection in the trunk, which is an easy DIY fix.
- When buying used, prioritize assemblies with clear, crack-free lenses and clean, corrosion-free bulb sockets.
Symptoms of Tail Lamp Failure
Failure in the 1984-1987 Buick Regal tail lamp system can manifest in several ways, ranging from simple bulb issues to problems with the entire assembly. Identifying the specific symptom is the first step in a correct diagnosis.
- Lights Are Dim or Flickering: This is a classic sign of a poor electrical ground connection, a very common issue on older vehicles. It can also be caused by corrosion inside the bulb socket, which increases resistance and reduces the power reaching the bulb.
- One or More Functions Don't Work: If the running light works but the brake light doesn't (or vice-versa), the cause is often a burned-out dual-filament bulb. If all lights on one side are out, it could point to a bad bulb, a corroded socket, or a problem with the wiring harness connector for that assembly.
- Moisture or Condensation Inside the Lens: If you see fogging or water droplets inside the tail lamp, the seal between the lens and the housing has failed. This moisture will accelerate corrosion on bulb sockets and electrical contacts, leading to intermittent or total failure.
- Cracked or Hazy Lens: Physical damage like cracks or splits compromises the housing's ability to keep out water. Over time, UV exposure from the sun can also cause the plastic lens to become cloudy or yellowed, significantly reducing light output and making your car harder to see.
- Melted Housing: In some cases, excessive heat from the bulb, often caused by high resistance from a poor ground or incorrect bulb type, can melt the plastic housing or the bulb socket itself.
Pro Tip: Before assuming the entire assembly is bad, always check the simplest things first: the bulb and the fuse. On these Regals, check the multi-wire connector located in the driver's side of the trunk for any corrosion or loose pins, as it controls all rear lighting functions.
Buying a Used 1984-1987 Regal Tail Lamp
Due to the age of these vehicles, a used OEM tail lamp is often the most practical and affordable option. However, careful inspection is key to getting a good part. Here’s what to look for:
1. Verify Fitment: 2-Door Coupe ONLY
This is the most important check. These tail lamps only fit the 2-door coupe versions of the 1984-1987 Buick Regal, including the Grand National and T-Type. They will NOT fit 4-door sedans or station wagon models, which use a different body and lamp design.
2. Inspect the Lens and Housing
- Check for Cracks and Haze: Hold the lamp up to a light source. Look for any cracks, even hairline fractures, especially around the screw holes and edges. Check for cloudy or yellowed plastic that could reduce light visibility.
- Look for Signs of Moisture: Check for any dried water spots, mineral deposits, or a faint film on the inside of the lens. This indicates the seal has failed in the past.
- Examine the Mounting Studs: The assembly attaches to the car body with several threaded studs. Ensure all studs are present, straight, and not cracked at the base. A broken stud can cause the lamp to be loose and allow water to leak into the trunk.
- Inspect the Housing for Brittleness: Decades of heat cycles can make the plastic housing brittle. Gently press on the back of the housing to feel for any excessive flex or cracking sounds.
3. Check the Bezel Trim: Chrome vs. Black
The outer decorative trim, or bezel, is the main cosmetic difference between models. Make sure you get the one that matches your car's trim level for a factory-correct appearance.
- Chrome Bezels: Used on standard Buick Regal and Regal Limited models.
- Black Bezels: Used on the performance-oriented Grand National, T-Type, and GNX models.
While the assemblies are physically interchangeable (a chrome lamp will bolt onto a Grand National), using the correct bezel is crucial for restoration accuracy.
4. Examine the Bulb Sockets and Wiring
This is a critical step. Pull out any existing bulbs and inspect the metal contacts inside the sockets. Look for any white or greenish corrosion, rust, or signs of melting. Corroded sockets are a primary cause of electrical issues and are difficult to repair properly. If the sockets are clean and shiny, the part is much more likely to be reliable.
Warning: A cheap aftermarket assembly might seem like a good deal, but they often suffer from poor-quality seals that lead to immediate water leaks, and the plastic may not have the same UV resistance as OEM parts, leading to premature fading and cracking.
Known Issues, TSBs, and Recalls
For a vehicle of this age, formal Technical Service Bulletins (TSBs) are rare for lighting issues. However, the community of owners has identified several common problems:
- Bad Grounds: The most frequently cited issue is a poor ground connection. The rear lighting harness grounds to the body inside the trunk, often near the trunk latch support. If this connection becomes rusty or loose, it can cause a wide range of problems, including dim lights, flickering, or lights not working at all. Cleaning the contact point to bare metal is a common and effective fix.
- Corroded Harness Connector: The main wiring harness for the rear lights connects inside the trunk on the driver's side. This connector can become corroded over time, leading to intermittent failures.
A search of the National Highway Traffic Safety Administration (NHTSA) database shows no recalls specifically for the tail lamps on the 1984-1987 Buick Regal. Recalls for this vehicle pertain to other issues like seat latches, bumpers, and fuel filters.
Replacement Guide
Replacing the tail lamp assembly on a 1984-1987 Regal is a straightforward job suitable for a DIYer with basic tools.
- Difficulty: 1 out of 5
- Estimated Time: 15-30 minutes per side
- Tools Needed: Deep socket and ratchet (size may vary), flathead screwdriver (for trim clips if applicable).
Step-by-Step Instructions:
- Disconnect the Battery: As a safety precaution, disconnect the negative battery terminal.
- Access the Assembly: Open the trunk and pull back the carpet or trim liner behind the tail light to expose the back of the assembly and its mounting studs.
- Unplug the Wiring Harness: Disconnect the main electrical connector going to the tail lamp assembly.
- Remove Retaining Nuts: Use a deep socket to remove the nuts holding the assembly to the car's body. There are typically several of them. Keep them in a safe place.
- Remove the Assembly: Gently push the studs from the inside to pop the assembly out of the body. Pull it straight back and away from the car. The old gasket may cause it to stick slightly.
- Install the New Assembly: Position the new tail lamp, ensuring the studs go through the holes in the body. Hand-tighten the retaining nuts, then snug them down with the ratchet. Do not overtighten, as this can crack the plastic housing.
- Reconnect and Test: Plug the wiring harness back in. Reconnect the battery and test all light functions (running lights, brake lights, turn signals, reverse lights) before reinstalling the trunk liner. 🎬 Watch this step-by-step tutorial on installing Regal LED tail lights.
Cost Comparison
Prices for a 1984-1987 Buick Regal tail lamp can vary significantly based on condition and type.
| Part Type | Estimated Cost (per assembly) | Notes |
|---|---|---|
| New OEM | $200 - $500+ (if found) | Largely discontinued and very difficult to find. Prices reflect new-old-stock (NOS) rarity. |
| New Aftermarket | $100 - $300 | Readily available from many retailers. Quality of fit and seals can be inconsistent. |
| Used OEM | $50 - $150 | Best value. Price depends heavily on condition, especially lens clarity and whether it's a chrome or black bezel model. |
| Shop Labor | $40 - $100 | Typically less than one hour of labor per side. |
Frequently Asked Questions (FAQ)
Can I put Grand National (black trim) tail lights on my standard Regal?
Yes, the assemblies are physically identical and will bolt directly in place. This is a popular cosmetic upgrade for owners of standard Regals who prefer the blacked-out look of the Grand National.
Why are my tail lights dim even with new bulbs?
Dim lights are almost always a sign of a bad ground connection or high resistance in the circuit. Check the main ground wire in the trunk, usually attached to the body near the latch support. Unscrew it, clean the contact point on the body and the wire's terminal until they are shiny, and re-secure it tightly.
Will these tail lights fit my 1985 Buick Regal sedan?
No. These tail lamp assemblies are specifically for the 2-door coupe models only. The 4-door sedan and station wagon models have a different body shape and use completely different tail lamps.
Can I upgrade my tail lights to LED?
Yes, several companies offer aftermarket LED circuit boards designed to fit inside the stock 1984-1987 Regal tail lamp housings. These kits replace the original bulbs and can offer brighter light and sequential turn signal functions. Installation requires disassembling the factory housing and some wiring modifications.
What are the OEM part numbers for these tail lamps?
Verified OEM part numbers include 16501873, 16501874, 16501917 (Left Hand Housing), and 16501918 (Right Hand Housing). However, due to the age and various supersessions by GM, it's always best to match the part visually, paying close attention to the bezel color and ensuring it's for a 2-door coupe.
Helpful Videos
Technical Specifications
OEM Part Numbers: 16501873 16501874 16501882 16501918 918488 16501881 16501917 5974331 5974337 918487
Fits 2-door G-Body coupe models. Assembly includes lens, housing, and bezel. Available with chrome or black bezels.
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Buick Regal:
- 🎬 Helpful Videos
- Symptoms of Tail Lamp Failure
- Buying a Used 1984-1987 Regal Tail Lamp
- 1. Verify Fitment: 2-Door Coupe ONLY
- 2. Inspect the Lens and Housing
- 3. Check the Bezel Trim: Chrome vs. Black
- 4. Examine the Bulb Sockets and Wiring
- Known Issues, TSBs, and Recalls
- Replacement Guide
- Step-by-Step Instructions:
- Cost Comparison
- Frequently Asked Questions (FAQ)
- 🎟️ Get 5% Off