Replacing a bulb in submersible trailer lights, while seemingly simple, requires understanding the unique challenges presented by their underwater environment. The key is to ensure a watertight seal after replacement to prevent corrosion and future failures. This guide will equip you with the knowledge and steps to confidently tackle this task and keep your trailer safely illuminated.
Understanding Submersible Trailer Lights
Submersible trailer lights are designed to withstand the harsh conditions of being submerged in water, typically when launching or retrieving a boat. This requires a robust design and careful attention to sealing every point of entry for water. When a bulb burns out, it’s crucial to not only replace it but also to reinstate that protective barrier. Neglecting this can lead to premature bulb failure and corrosion of the electrical components.
Identifying the Correct Bulb
Before you begin, it’s crucial to identify the correct bulb type. Most submersible trailer lights use standard automotive bulb types, such as 1157 (dual filament for brake and tail lights) or 194 (for marker lights). However, it’s always best to consult your trailer’s manual or the markings on the existing bulb itself. Incorrect bulb types can cause improper function or even damage your electrical system. A quick search online using the bulb’s markings can easily confirm its compatibility.
Gathering Your Tools and Materials
- New Bulb: As determined in the previous step.
- Screwdriver: Typically Phillips head, but flathead may be required for some models.
- Dielectric Grease: Crucial for preventing corrosion and ensuring a waterproof seal.
- Clean Rags: For wiping away dirt and moisture.
- Gloves (Optional): To protect your hands.
- Wire Brush (Optional): For cleaning corroded contacts.
Step-by-Step Bulb Replacement
This process generally applies to most submersible trailer lights, but slight variations might exist depending on the specific model. Always consult your trailer’s manual for specific instructions.
Step 1: Disconnecting the Trailer Wiring
Before you even touch the light, disconnect your trailer wiring harness from your vehicle. This is a vital safety precaution to prevent electrical shock or damage to your vehicle’s electrical system.
Step 2: Accessing the Bulb Housing
The bulb is typically accessed by removing a lens cover. This is often held in place by screws. Carefully remove the screws and set them aside in a safe place. Some lens covers might be held on with a snap-fit design. If so, gently pry it open with a flathead screwdriver, being careful not to break the plastic.
Step 3: Removing the Old Bulb
Once the lens cover is off, you can access the bulb. Most bulbs are either bayonet style (push in and twist) or wedge style (simply pulled out). Note the orientation of the bulb before removing it, as this will help you install the new bulb correctly.
Step 4: Cleaning the Contacts
Before inserting the new bulb, inspect the contacts inside the bulb socket. If you see any corrosion, use a wire brush or sandpaper to clean the contacts thoroughly. This will ensure a good electrical connection.
Step 5: Applying Dielectric Grease
This is arguably the most important step. Apply a generous amount of dielectric grease to the base of the new bulb and the inside of the bulb socket. This grease will prevent water from entering and causing corrosion. Don’t be shy; a good coating is essential.
Step 6: Installing the New Bulb
Insert the new bulb, ensuring it is oriented correctly. For bayonet style bulbs, push it in and twist until it locks into place. For wedge style bulbs, simply push it in until it seats firmly.
Step 7: Reassembling the Light
Carefully replace the lens cover and secure it with the screws. Make sure the lens is properly aligned and that the screws are tightened securely. If the lens uses a snap-fit design, ensure it is fully engaged and sealed.
Step 8: Testing the Light
Reconnect your trailer wiring harness to your vehicle and test the light. Check all functions – tail lights, brake lights, and turn signals – to ensure the new bulb is working correctly.
Troubleshooting Common Issues
- Bulb Doesn’t Light: Check the connection to the vehicle, the trailer wiring, and the bulb itself. Ensure the bulb is correctly seated in the socket and the contacts are clean.
- Rapid Blinking: This often indicates a problem with the ground connection. Check and clean the ground connection points.
- Bulb Burns Out Quickly: This could be due to water entering the light fixture. Ensure the lens is properly sealed and that dielectric grease is applied liberally.
Frequently Asked Questions (FAQs)
FAQ 1: What is Dielectric Grease and Why is it Important?
Dielectric grease is a non-conductive, silicone-based compound that prevents corrosion and moisture from interfering with electrical connections. In submersible trailer lights, it’s essential for creating a waterproof seal and preventing premature bulb failure due to corrosion. Without it, water can enter the socket, causing the bulb to short out and the contacts to corrode.
FAQ 2: Can I Use Regular Automotive Bulbs in Submersible Trailer Lights?
Yes, in most cases. Submersible trailer lights typically use standard automotive bulb types like 1157 or 194. However, always verify the correct bulb type in your trailer’s manual or on the old bulb before replacing it.
FAQ 3: How Often Should I Replace My Trailer Light Bulbs?
There’s no set schedule. Replace bulbs as soon as they burn out. However, it’s a good practice to inspect your trailer lights regularly, perhaps before each trip, to ensure they are functioning properly.
FAQ 4: What if My Trailer Lights are Constantly Shorting Out?
This usually indicates a problem with the wiring. Check all connections for corrosion or damage. You may need to replace the entire wiring harness if the damage is extensive. Consider upgrading to LED lights, as they are more resistant to vibration and have a longer lifespan.
FAQ 5: Are LED Trailer Lights a Good Upgrade?
Absolutely. LED trailer lights are more durable, energy-efficient, and have a significantly longer lifespan than traditional incandescent bulbs. They are also less susceptible to vibration damage, making them ideal for trailers. While they might have a higher initial cost, the long-term benefits outweigh the price.
FAQ 6: How Do I Find the Ground Connection on My Trailer?
The ground connection is typically a white wire attached to the trailer frame. Ensure this connection is clean and secure. Corrosion at the ground connection is a common cause of electrical problems in trailers.
FAQ 7: My Lens Cover is Cracked. Can I Still Use the Light?
No. A cracked lens cover will allow water to enter the light fixture, leading to corrosion and bulb failure. Replace the lens cover immediately. You may be able to find a replacement lens cover separately, or you may need to replace the entire light fixture.
FAQ 8: How Do I Know if My Trailer Wiring Harness is Bad?
Signs of a bad wiring harness include: flickering lights, intermittent loss of lights, and corrosion on the wiring connectors. Inspect the entire harness for damage. If the damage is extensive, it’s best to replace the entire harness.
FAQ 9: Can I Upgrade My Incandescent Trailer Lights to LED Lights?
Yes, you can. However, you may need to replace the entire light fixture as LED bulbs are often integrated into the fixture. Also, some older vehicles may require a load resistor to prevent rapid flashing with LED lights.
FAQ 10: My Trailer Lights are Always On, Even When Disconnected from the Vehicle. What Could Be the Problem?
This usually indicates a short circuit in the wiring. Disconnect the battery (if equipped) and inspect the wiring harness for damage. A short circuit can drain your battery and potentially cause a fire.
FAQ 11: What if My Trailer Has Separate Lights for Turn Signals and Brake Lights?
Some trailers use a separate amber turn signal and a red brake light. In this case, you’ll need to identify the correct bulb type for each function and replace them accordingly.
FAQ 12: Where Can I Buy Replacement Submersible Trailer Light Bulbs?
Replacement bulbs are readily available at most auto parts stores, marine supply stores, and online retailers like Amazon. Be sure to purchase the correct bulb type for your specific trailer lights.