1994 Ford Explorer & Mazda Navajo High Mount Stop Lamp: Fixing Leaks & Failures
This guide covers the common failures, water leak problems, and replacement options for the high-mounted third brake light on the 1994 Ford Explorer and Mazda Navajo.
- The most common issue with this part is not light failure, but a leaking gasket that allows water into the vehicle's interior.
- The 1994 Ford Explorer and 1994 Mazda Navajo use the exact same high-mounted stop lamp.
- Replacement is extremely easy, requiring only a Phillips screwdriver and about 15 minutes.
- If your light is out, try replacing the inexpensive #912 or #921 bulb first before buying a whole new assembly.
Platform-Shared Part: 1994 Ford Explorer & 1994 Mazda Navajo
The 1994 Ford Explorer and the 1994 Mazda Navajo are built on the same platform, a practice known as badge engineering. Because of this, they share many parts, including the high-mounted stop lamp assembly. Whether you own the Ford Explorer (both 2-door Sport and 4-door models) or the Mazda Navajo, the information, part numbers, and procedures in this guide are identical for your vehicle.
Compatibility Warning: This lamp is for models with a rear liftgate. Before ordering, visually confirm that your vehicle's third brake light is mounted on the upper portion of the rear hatch.
Symptoms of a Failing High-Mounted Stop Lamp
Failure of this part typically presents in one of three ways. Diagnosis is usually straightforward.
- Light Does Not Work: The most common symptom is the light failing to illuminate when you press the brake pedal. This is most often caused by a burnt-out bulb.
- Water Leaking Into the Vehicle: Water stains on the interior headliner near the rear liftgate or moisture in the cargo area are strong indicators that the lamp's gasket has failed. Over time, the foam or rubber gasket becomes brittle and compressed, losing its ability to seal against the vehicle body.
- Flickering or Dim Light: If the light works intermittently, flickers, or appears dim, it could be due to a failing bulb, a loose connection at the electrical plug, or corrosion on the bulb socket or connector pins.
Known Issues: The Common Water Leak
The most frequently reported problem with the high-mounted stop lamp on these first-generation Explorers and Navajos is not electrical failure, but water intrusion. The original factory gasket is prone to drying out and cracking after decades of exposure to heat and weather. When it fails, rainwater runs down the liftgate, seeps past the compromised seal, and drips into the vehicle's interior.
If left unaddressed, this can lead to:
- Stained or damaged headliners
- Mold and mildew growth
- Corrosion on the lamp's electrical connector, causing light failure
- Puddles in the rear cargo area
Pro Tip: When replacing the lamp assembly or even just the bulb, it's wise to apply a thin bead of clear RTV silicone sealant around the housing or install a new gasket to prevent future leaks. Even new aftermarket lamps can benefit from this extra layer of protection.
Buying a Used High-Mounted Stop Lamp
A used OEM lamp is an excellent, cost-effective solution. However, given the age of these vehicles, a careful inspection is crucial before you buy.
What to Inspect:
- Lens Condition: Check the red plastic lens for cracks, deep scratches, and 'crazing' (a network of fine cracks). Severe fading or haziness from UV exposure can reduce light output and is a sign of a worn part.
- Housing Integrity: Inspect the black plastic housing, especially the mounting points where the screws pass through. This area can become brittle and crack if the screws were overtightened.
- Gasket Condition: Look at the foam gasket on the back. It should be pliable and have some thickness. If it's completely flat, crumbling, or missing, it is useless and will cause a leak. Plan on replacing the gasket or using RTV sealant regardless of its condition.
- Electrical Connector: Check the connector pins for any green or white corrosion. Corroded pins can prevent the light from working and indicate it has suffered from water damage.
For a simple, non-moving part like this, a good used OEM unit is often superior in plastic and lens quality to the cheapest aftermarket options. However, reputable aftermarket brands like Dorman offer a good alternative that comes with a new gasket, which can be a significant advantage.
Replacement Guide
Replacing the high-mounted stop lamp is a very easy DIY job that requires basic hand tools.
Difficulty: 1 out of 5
Estimated Time: 15 minutes
Tools Needed:
- Phillips head screwdriver
- Panel removal tool (optional, but helpful)
- Rag and cleaning solution
Step-by-Step Instructions:
- Access the Lamp: Open the rear liftgate. The lamp is secured by two Phillips head screws visible on the exterior of the lens.
- Remove the Screws: Carefully remove the two screws holding the lamp assembly to the liftgate.
- Detach the Lamp: Gently pull the lamp assembly away from the liftgate. It may be slightly stuck due to the old gasket.
- Disconnect Electrical Connector: Squeeze the tab on the electrical connector and pull it to detach it from the lamp housing.
- Clean the Area: Thoroughly clean the mounting surface on the liftgate. Remove any old gasket material, dirt, or residue to ensure the new lamp or gasket can form a good seal.
- Install the New Lamp: Connect the electrical plug to the new or used lamp. Before mounting, have a helper press the brake pedal to confirm the light works.
- Seal and Secure: Position the new lamp, ensuring the gasket is properly seated. If you are adding RTV sealant, apply it to the housing now. Re-install the two screws, tightening them until they are snug. Do not overtighten, as this can crack the plastic housing or lens.
Cost Comparison
The cost to get your third brake light working again varies significantly depending on the solution you choose.
| Part or Service | Estimated Cost |
|---|---|
| New OEM (NOS) | $150 - $300+ (if found) |
| New Aftermarket (Dorman 923-201) | $35 - $60 |
| Used OEM | $25 - $75 |
| Bulb Only (#912 or #921) | $5 - $10 for a pair |
| Shop Labor | $40 - $80 |
Frequently Asked Questions (FAQ)
Can I just replace the bulb instead of the whole lamp?
Yes. If the only problem is a non-working light, the cause is almost always a burnt-out bulb. The correct replacement is typically a #912 or #921 incandescent bulb, which is inexpensive and widely available. You would follow the same removal steps, twist the bulb socket out of the housing, replace the bulb, and reinstall.
What is the best way to fix the water leak?
The most reliable fix is to replace the entire lamp assembly with a new aftermarket unit that includes a fresh gasket. Alternatively, you can buy a new gasket separately or create a seal using a thin bead of clear or black RTV silicone sealant on the back of your existing lamp before reinstalling it. Simply cleaning and reinstalling the old, compressed gasket will likely not stop the leak.
Is the 1994 Mazda Navajo third brake light the same as the Ford Explorer's?
Yes, they are the exact same part. The 1994 Navajo is a rebadged 2-door Ford Explorer Sport, and they share the same liftgate and high-mounted stop lamp. Any part listed for a 1994 Explorer will fit a 1994 Navajo.
Is it illegal to drive without a working third brake light?
Yes, it can be. High-mounted third brake lights have been mandatory on all new light trucks sold in the U.S. since 1994. While enforcement varies, a non-functional light can result in a 'fix-it' ticket and will cause your vehicle to fail a safety inspection in many states. It's also a safety hazard that increases your risk of being rear-ended.
Technical Specifications
OEM Part Numbers: F3TZ13A613A F49Z-13A613-B F49Z13A613B ZZL0-51-310A ZZL051310A
Bulb Type: 912 or 921 Incandescent Mounting: Liftgate-mounted Common Aftermarket Part Number: Dorman 923-201
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.
- Ford Explorer:
- Mazda Navajo:
- Platform-Shared Part: 1994 Ford Explorer & 1994 Mazda Navajo
- Symptoms of a Failing High-Mounted Stop Lamp
- Known Issues: The Common Water Leak
- Buying a Used High-Mounted Stop Lamp
- What to Inspect:
- Replacement Guide
- Tools Needed:
- Step-by-Step Instructions:
- Cost Comparison
- Frequently Asked Questions (FAQ)
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