Welcome to your Tailgate Subwoofer Enclosure for your Bronco! 

The following guide will walk you through the entire installation which includes a step by step catalog.   

If you have any questions, or need anything during the installation, we're only a phone call away.  We're available Monday-Friday, 9am-5pm est. for any support needed, or you can shoot us an email at support@trailseven.com. 

These installation notes are intended to be used in conjunction with the installation videos based on the your bundle.

Tech Tips

Tools You Will Need:

• Panel Removal Tool

• 3/8th Drill Bit

• Threaded Insert Rivet Tool

• T-30 Torx (Driver's Side)

• Zip Ties 
  

• Marker

• 6mm Socket

• Phillips Head Drill Bit
  

Step 1: Remove Tailgate Trim Panel

Use a plastic panel removal tool to remove the trim panel from the tailgate.

Installation Note:
Begin at one edge and work gradually around the panel. Avoid prying too aggressively to prevent damaging retaining clips.

Step 2: Attach L-Brackets to Enclosure

Secure the provided L-brackets to the enclosure in the exact orientation shown in the installation reference photo.

Installation Note:
Bracket positioning is critical to ensure proper alignment with the vehicle mounting locations. The wire terminal on the enclosure is pre-mounted and pre-wired—no additional terminal work is necessary.

Step 3: Mark Mounting Hole Locations

Position the enclosure into the tailgate cavity, resting it in the designated support slots. Slide the enclosure fully toward the passenger (right) side for best alignment. Mark the mounting hole positions.

Installation Note:
Use a marking tool that contrasts well with the vehicle paint or interior (such as a silver Sharpie or masking tape). Having a second person hold the enclosure can help during this step.

Step 4: Drill Mounting Holes

Drill 3/8" holes at the previously marked locations.

Installation Note:
Use a step bit or high-quality metal drill bit. Ensure that no wiring or components are behind the surface before drilling.

Step 5: Install Rivet Nuts

Install the included 1/4"-20 rivet nuts into the drilled holes using a rivet nut installation tool.

Installation Note:
Rivet nuts create a strong, threaded anchor point for secure enclosure mounting. Manual or powered rivet nut tools are both acceptable. Follow the tool’s instructions for proper crimping.

Step 6: Mount the Enclosure

Secure the enclosure to the tailgate using the provided 6mm bolts.

Installation Note:
Tighten bolts evenly. Avoid overtightening, which could damage the rivet nuts or enclosure brackets.

Step 7: Connect and Mount the Subwoofer

Connect the subwoofer’s terminals to the pre-wired leads inside the enclosure (red = positive, black = negative). Then, mount the subwoofer using the included screws.

Installation Note:
Confirm proper polarity for optimal subwoofer performance. Use a screwdriver or drill with a clutch to avoid overtightening the mounting screws.

Step 8: Route Subwoofer Wire to Amplifier

Route the pre-installed subwoofer wire from the enclosure into the vehicle, following the OEM wiring harness. Secure it using zip ties or tape (not included) and continue routing it to the amplifier.

Installation Note:
Following the OEM harness path helps protect the wire from abrasion and heat, and keeps the installation clean and professional.

Step 9: Connect to Amplifier

Connect the subwoofer wire to the amplifier’s appropriate output terminals.

Final Check:
Verify that all connections are secure, wiring is safely routed, and the enclosure is fully mounted. Test the subwoofer before reinstalling any trim panels.

Installation Guide for the tailgate subwoofer enclosure: LINK