5 Steps to Install Subaru Bumper Flood Lights Like a Pro

Upgrading your Subaru with powerful bumper flood lights can transform night driving, turning shadowy trails into daylight. However, the satisfaction of illuminating the path ahead hinges on a proper installation. A haphazard approach can lead to frustrating shorts, flickering lights, or even damage to your vehicle’s electrical system. Therefore, this guide will provide a clear, step-by-step process for wiring your new flood lights, ensuring a professional finish and reliable performance. From choosing the right gauge wire to properly grounding the system, we’ll cover every crucial detail. Furthermore, we’ll offer insights into selecting the optimal mounting location and aiming your lights for maximum effectiveness, ensuring your investment pays off with enhanced visibility and a polished look.

Firstly, gather the necessary tools and materials. This includes your chosen flood lights, a wiring harness with a relay and inline fuse, wire strippers and crimpers, electrical tape, zip ties, and a multimeter. Additionally, you’ll need basic hand tools like a screwdriver, drill with appropriate bits, and possibly a socket set depending on your Subaru’s specific bumper configuration. Once you have everything assembled, begin by disconnecting the negative terminal of your battery as a safety precaution. Next, determine the best mounting location for your lights, ensuring they won’t interfere with other components and provide optimal light projection. Carefully mark and drill the necessary mounting holes, securing the lights with appropriate hardware. Subsequently, route the wiring harness from the lights, through the engine bay firewall, and into the cabin, taking care to avoid areas of high heat or moving parts. Use zip ties to secure the wiring and prevent it from dangling or rubbing against other components. This meticulous approach will not only result in a cleaner installation but also prevent potential problems down the road.

Now comes the critical part: wiring the lights. Connect the positive and negative wires from the lights to the corresponding wires on the wiring harness. Then, connect the relay’s power wire to a suitable 12V power source in the fuse box, preferably one that is switched with the ignition. Ground the relay’s ground wire to a clean, unpainted metal surface on the chassis. Install the inline fuse as close to the power source as possible, providing an essential layer of protection against short circuits. Finally, connect the switch wire from the relay to your chosen switch location in the cabin. Before reconnecting the battery, meticulously double-check all connections to ensure they are secure and properly insulated with electrical tape. Afterward, reconnect the negative battery terminal and test the lights. Adjust the aiming of the lights as needed to achieve the desired beam pattern. With the installation complete, enjoy the enhanced visibility and added safety provided by your new bumper flood lights. Moreover, regularly inspect the wiring and connections to ensure continued reliable performance and address any potential issues promptly.

Preparing Your Subaru for Installation

Getting your Subaru ready for those awesome bumper flood lights is the first step. This prep work ensures a smooth installation process and helps prevent any hiccups down the road. So, let’s dive into what you need to do before you start wiring anything up.

Gathering Your Tools and Materials

Before you get started, make sure you have everything you need. Having all your ducks in a row will make the installation process much smoother and less frustrating. Here’s a handy list:

Getting Up Close and Personal with Your Subaru’s Electrical System

This is where we really get into the nitty-gritty. Understanding your Subaru’s electrical system is crucial for a successful installation. First off, locate the battery—it’s typically under the hood, but some models might have it elsewhere. Disconnect the negative terminal using a wrench. This prevents any accidental shorts or shocks while you’re working. Safety first, always!

Next, you’ll want to figure out where you’re going to tap into your Subaru’s electrical system for power. A good spot is often near the fuse box, which is usually located under the dash on the driver’s side or sometimes in the engine compartment. Consult your Subaru’s owner’s manual for the exact location. You’ll be looking for an accessory power source—one that only receives power when the ignition is on. This ensures your flood lights aren’t constantly draining your battery.

Now, let’s talk about grounding. A solid ground connection is vital for your lights to work correctly. Look for a clean, unpainted metal surface near your chosen power source. This could be a bolt or screw already in place. You can use this as your grounding point by connecting the ground wire from your wiring harness to it. Make sure the connection is tight and secure.

Finally, plan the route for your wiring. Think about how you’ll run the wires from the battery, through the firewall (the barrier between the engine compartment and the cabin), to the switch, and finally, to the lights themselves. Try to find existing pathways and openings to avoid drilling unnecessary holes in your car. Use zip ties to keep the wiring neat and tidy, and secure it away from any moving parts or hot surfaces. This not only looks professional but also prevents potential damage to the wiring.

Important Considerations

Before moving on, take a moment to consider the amperage draw of your flood lights. If they draw a significant amount of current, you might need to upgrade your wiring or use a relay to prevent overloading the circuit. Check the specifications of your lights and consult your Subaru’s wiring diagram to be sure.

Also, familiarize yourself with your Subaru’s specific wiring colors and conventions. This will help you avoid any confusion during the installation process and prevent accidental shorts or damage to your car’s electrical system. Again, your owner’s manual is your best friend here.

Wiring the Flood Lights to a Relay Harness

Using a relay harness is the safest and most effective way to power your new Subaru bumper flood lights. It protects your Subaru’s electrical system from overload and provides a consistent power supply to the lights. Let’s break down how to wire everything up.

Understanding the Relay Harness

A relay harness acts as an intermediary between your Subaru’s battery, the flood lights, and the switch that controls them. The relay itself is a small electromagnetic switch that allows a small current (from your switch) to control a much larger current (going to the lights). This keeps the high amperage current away from your Subaru’s sensitive switches and wiring.

Connecting to the Battery

First, locate your Subaru’s battery. It’s usually under the hood. You’ll see two terminals, a positive (+) and a negative (-). Connect the relay harness’s positive wire (often red) to the positive terminal of the battery. Make sure the connection is secure. Next, connect the relay harness’s negative wire (often black) to the negative terminal of the battery. Again, ensure a tight connection. Some harnesses may have a ground wire (also black) which should be connected to a clean, unpainted metal surface on the Subaru’s chassis. This provides a solid ground connection.

Wiring the Flood Lights

Now, connect the relay harness’s output wires to your flood lights. Most harnesses will have two output wires, one for each light. Match the polarity (positive and negative) on the harness and the lights carefully. A good way to remember is red to red (positive) and black to black (negative). Ensure all connections are secure and waterproofed using heat shrink tubing or electrical tape.

Wiring the Switch and Integrating with the Subaru

This part involves connecting the relay’s trigger wire to a switch, which will then be used to turn the flood lights on and off. This switch can be mounted practically anywhere you find convenient – inside the cabin, on the dash, or even hidden away for a stealthier setup. Let’s go through the process step-by-step:

1. Choosing a Switch Location: Consider accessibility and ergonomics. A switch located in a convenient spot will be easy to use without causing distractions while driving. Common locations include the dash, center console, or even a blank switch panel if your Subaru has one.

2. Routing the Switch Wire: Carefully route the switch wire from the relay harness, through the firewall, and into the cabin. Use existing grommets or carefully create a new hole if needed, ensuring you protect the wire from chafing or pinching. This step often requires a bit of patience and ingenuity to get the wire routed cleanly and safely.

3. Connecting to an Existing Circuit (Optional): If you’d like your flood lights to turn on with your high beams or parking lights, you can tap into the corresponding circuit. Consult your Subaru’s wiring diagram to identify the correct wire. Use a test light or multimeter to confirm the wire’s function. Use a quick splice connector to securely tap into the circuit. This method allows for integrated control, making it easier to use the flood lights in conjunction with your other lights.

4. Connecting to a Dedicated Power Source (Optional): For independent control, connect the switch wire to a dedicated 12V power source. This could be a switched source (powered only when the ignition is on) or a constant source (always powered). A switched source is generally recommended to prevent accidental battery drain. Use an add-a-circuit fuse tap to easily connect to an existing fuse slot in your Subaru’s fuse box. Choose a fuse that is related to an accessory that you typically use, such as the radio. This ensures that the circuit will have power when you need it. This method offers the most flexibility and allows for easy installation.

5. Final Switch Connection: Finally, connect the switch wire to the switch itself. Most switches will have clear markings indicating which terminal to use. Once connected, test the switch to ensure the flood lights turn on and off correctly. Secure any loose wiring and double-check all connections to prevent any issues down the road.

Connecting the Relay to the Battery and Ground

This part of the installation is crucial for safely powering your new Subaru bumper flood lights. It involves connecting the relay directly to your Subaru’s battery for a consistent power source and ensuring a solid ground connection for proper circuit completion. Getting this right is key to avoiding electrical issues down the road.

Preparing the Relay Connections

Before you start connecting anything, it’s a good idea to gather your tools and prepare the relay wires. You’ll need a wire stripper/crimper, some ring terminals, and potentially some heat shrink tubing for extra protection. First, carefully strip about ¼ inch of insulation from the ends of the relay wires designated for the battery positive and negative connections. If you’re using ring terminals (highly recommended), crimp them securely onto the exposed wire ends. If you opt for heat shrink tubing, slide a piece over the wire before crimping and then use a heat gun or lighter to shrink it snugly around the terminal. This provides extra insulation and strain relief.

Connecting to the Positive Battery Terminal

Locate the positive terminal on your Subaru’s battery. It’s usually marked with a “+” symbol and a red cover. Before you do anything, disconnect the negative battery terminal (marked with a “-” and a black cover) to prevent accidental shorts. Now, loosen the nut on the positive terminal post using a wrench. Place the ring terminal connected to the relay’s positive wire onto the post and tighten the nut securely. Ensure the connection is tight and the wire won’t easily come loose.

Connecting to Ground

Finding a good grounding point is essential. Look for a clean, unpainted metal surface on the vehicle’s chassis or frame near the battery. A good option is often an existing grounding bolt. Again, use a wrench to loosen the bolt. Attach the ring terminal of the relay’s ground wire to the grounding point and tighten the bolt securely. Make sure the connection is metal-on-metal for optimal grounding.

Detailed Wiring and Safety Precautions

Let’s dive a little deeper into the wiring process and discuss some important safety precautions. Your relay should have four labeled terminals: 85, 86, 30, and 87. Terminal 30 connects to the positive battery terminal as described earlier. Terminal 85 is typically the ground connection, which we’ve also covered. Terminals 86 and 87 are for the switch and the lights, respectively. We’ll cover these connections in a later section. For now, focus on the battery and ground connections. Double-check all your connections for tightness. A loose connection can cause voltage drops, overheating, or even a fire. Consider using a multimeter to test the connections for continuity and ensure they are properly grounded. Remember, safety first! Always disconnect the negative battery terminal before working on any electrical components in your vehicle. This prevents accidental shorts and potential damage to your electrical system. After connecting the ground wire, reconnect the negative battery terminal.

Wiring Table Summary

Testing the Relay

Once you have connected the relay to the battery and ground, it’s a good idea to perform a quick test. This helps ensure the relay is functioning correctly and receiving power. You can use a multimeter to test for voltage across the relay terminals. Alternatively, you can temporarily connect a test light or a low-power device to terminal 87 (which will eventually connect to your lights) to see if it powers on when the switch (which will connect to terminal 86) is activated. This simple test can save you a lot of troubleshooting later on.

Routing the Wiring Through the Firewall

Getting the wiring from your flood lights into the cabin of your Subaru to connect to the switch and power source is a crucial step. This involves passing the wires through the firewall, which is the barrier between the engine compartment and the interior. It sounds daunting, but with a little patience and the right tools, it’s manageable.

Locating a Suitable Grommet

First, you’ll need to find a suitable grommet or access point. A grommet is a rubber seal that allows existing wiring to pass through the firewall. Look for one that’s relatively close to where you’ve mounted your lights and that has enough space to accommodate your new wires without damaging existing ones. Sometimes, you might find an unused grommet, which is ideal. Other times, you’ll need to carefully route the wires through an existing one. A flashlight and a small mirror can be super helpful for inspecting the firewall from both sides.

Preparing the Wiring

Before you start pushing wires through, prepare them. This typically involves applying some electrical tape to the ends to create a stiff, pointed tip. This helps guide the wires through the grommet and prevents them from fraying. Some people also like to use a wire snake or a coat hanger to help fish the wires through tight spaces.

Passing the Wires Through the Firewall

Carefully push the taped end of your wiring through the chosen grommet. You might need to apply a bit of pressure, but avoid forcing it. If it feels too tight, try a different grommet or consider using a smaller gauge wire. Once you’ve fed a sufficient length of wire through to the interior, you can move to the next step.

Sealing the Grommet

Once the wires are through, it’s essential to seal the grommet properly to prevent water and noise from entering the cabin. If you used an existing grommet, make sure your new wires haven’t compromised the seal. You can use silicone sealant or similar material to create a watertight barrier around the wires. This is a small step, but it’s really important to prevent future problems.

Detailed Wiring Path and Considerations for a Subaru (Example)

Let’s take a closer look at a common routing scenario in a Subaru Forester, though the general principles apply to other models. A popular entry point is a grommet located near the steering column. You can access this from the engine bay, usually near the brake booster. Identify the grommet visually and, if possible, by touch from inside the cabin near the pedals. Once located, carefully feed the wires through. It’s often easier to work from the engine bay side. Use a fish tape or stiff wire to guide your flood light wiring through. Be mindful of existing wiring harnesses and avoid pinching or damaging them. In some Subarus, you might find it easier to access the grommet by partially removing the plastic cowl below the windshield wipers. This gives you more room to maneuver. Remember to consult your Subaru’s specific wiring diagram for further clarity and to ensure you avoid interfering with critical systems.

Once the wires are through, secure them with zip ties to prevent them from dangling and potentially interfering with pedals or other components. Route the wiring along existing harnesses to keep things tidy and protected. This is where attention to detail really pays off, making future maintenance or troubleshooting much easier.

Securing and Finalizing the Installation

Wiring and Connections

Double-check all your wiring connections. Make sure everything is snug and secure. Loose connections can cause shorts, blown fuses, or simply prevent your lights from working. Give each connection a gentle tug to ensure it’s properly seated. If you used butt connectors, make sure they are crimped tightly and sealed with heat shrink tubing. For solder connections, inspect for a clean, solid joint. Exposed wiring should be wrapped with electrical tape or routed through wire loom for protection against abrasion and the elements.

Mounting the Flood Lights

Carefully mount your flood lights onto the bumper. Ensure they are positioned correctly and securely fastened. Depending on your chosen mounting method, this may involve tightening bolts, screws, or clips. If using bolts, add lock washers to prevent them from vibrating loose over time. If your flood lights came with mounting brackets, ensure they are properly aligned and securely attached to both the lights and the bumper. Take a step back and visually inspect the lights to confirm they are level and angled as desired.

Relay Installation (If Applicable)

If your wiring setup includes a relay, find a suitable location to mount it. This could be near the battery, fuse box, or another convenient spot within the engine bay. Secure the relay using a bolt, screw, or zip tie, ensuring it won’t move around or be exposed to excessive heat or moisture. Double-check the relay wiring connections one last time before moving on. A relay helps protect your vehicle’s electrical system by handling the higher current draw of the flood lights.

Fuse Integration

Install an inline fuse near the positive wire connection to the battery. This fuse acts as a safety measure, preventing damage to your wiring or vehicle in case of a short circuit. Choose a fuse with an appropriate amperage rating for your flood lights. Consult the light manufacturer’s specifications for the recommended fuse size. Most aftermarket flood light kits will include an appropriately sized fuse, but it’s always good to double-check. Ensure the fuse holder is securely attached and easily accessible for future replacement if needed.

Grounding the System

Find a clean, unpainted metal surface on the vehicle’s chassis to establish a solid ground connection. Use a ring terminal and a bolt to secure the ground wire. Ensure the connection is tight and free of corrosion. A poor ground can lead to dimming lights or intermittent operation. You can use a wire brush or sandpaper to clean the grounding point before attaching the wire. Some Subaru models have dedicated grounding points near the battery or fuse box, which are ideal locations.

Wire Tucking and Organization

Neaten up the wiring by carefully tucking it away along existing wiring harnesses. Use zip ties or wire clips to secure the wiring and prevent it from dangling or interfering with other components. This not only looks more professional but also helps protect the wiring from damage. Try to route the wiring away from moving parts or areas that generate excessive heat. A well-organized wiring setup makes it easier to troubleshoot any future issues.

Testing the Lights

Turn on your vehicle’s ignition and test the flood lights. Verify that they turn on and off as expected. Check the high and low beam settings if applicable. If the lights don’t work, systematically check the wiring connections, fuse, and relay (if used) to identify the problem. A multimeter can be helpful for diagnosing electrical issues.

Final Inspection and Adjustments

With the lights functioning correctly, perform a final inspection of the entire installation. Ensure all wiring is secure, connections are properly sealed, and the lights are mounted firmly. Make any necessary adjustments to the aiming of the lights to achieve the desired beam pattern. Consider the legal requirements for auxiliary lighting in your area. Avoid aiming the lights too high, as this can blind oncoming drivers. A slight downward angle is generally recommended. Also, re-confirm that the lights do not obstruct your view of the road or interfere with other vehicle functions.

Troubleshooting Common Issues

Sometimes, even with careful installation, issues can arise. Here’s a quick troubleshooting guide:

If you encounter any other problems, consult your vehicle’s wiring diagram or seek professional assistance.

Installing Electrics for Subaru Bumper Flood Lights

Installing flood lights on your Subaru’s bumper requires careful planning and execution to ensure safety and functionality. A professional installation is recommended, but for the experienced DIYer, here’s a general overview. This is not a comprehensive guide and should not replace consulting your vehicle’s specific wiring diagram and safety precautions.

Begin by disconnecting the negative battery terminal to prevent electrical shocks. Identify a suitable mounting location for the flood lights on your bumper, ensuring adequate structural support. Plan the wiring route, considering existing wiring harnesses and potential pinch points. Use high-quality automotive-grade wiring, relays, and fuses to ensure reliability and prevent damage to your vehicle’s electrical system.

Connect the flood lights to the relay, and the relay to the battery via a fused connection. The switch to activate the lights can be routed to the cabin, often through an existing firewall grommet. Thoroughly insulate all connections to prevent corrosion and short circuits. Once the wiring is complete, reconnect the negative battery terminal and test the lights. Adjust the aiming of the lights as needed. Ensure all wiring is secured and protected from the elements.

People Also Ask About Installing Electrics for Subaru Bumper Flood Lights

Where should I mount the relay for my Subaru bumper flood lights?

The relay should be mounted in a protected location, ideally close to the battery and away from excessive heat or moisture. Common locations include the engine bay’s fuse box area or inner fender.

What gauge wire should I use for my Subaru bumper flood lights?

The appropriate wire gauge depends on the amperage draw of your flood lights. Consult the manufacturer’s specifications for the lights. As a general rule, 14-gauge wire is suitable for lower-draw lights, while 12-gauge or even 10-gauge may be necessary for higher-power lights.

How do I route the wiring through the firewall?

Locating an existing grommet or unused access point in the firewall is the preferred method. If creating a new hole is necessary, use a rubber grommet to protect the wiring and prevent moisture intrusion. Carefully route the wiring to avoid interference with other components.

What type of fuse should I use?

Use an automotive-grade fuse rated slightly higher than the expected amperage draw of the lights. This will protect the circuit without constantly blowing. Refer to the light manufacturer’s specifications for guidance. Always use an inline fuse holder close to the battery connection for optimal protection.

Can I tap into existing wiring for power?

While tapping into existing wiring is possible, it’s generally not recommended. It can overload existing circuits and potentially cause issues with other vehicle systems. Directly wiring to the battery with a dedicated relay and fuse is the safest and most reliable approach.

How do I aim the flood lights correctly?

Aim the flood lights so they illuminate the desired area without blinding oncoming traffic. Park on a level surface facing a wall or garage door and adjust the lights until they achieve the desired pattern. Check local regulations for any restrictions on auxiliary lighting aim and usage.