BOSS BHD3F Harley Davidson Front System User's Manual

Introduction

The BOSS BHD3F is designed as a complete solution for upgrading the audio system on select Harley Davidson Road Glide and Street Glide models from 1998 to the present. This Plug-n-Play kit includes a compact, high-power four-channel Class D amplifier, a pair of 6.5-inch weatherproof speakers, and all necessary mounting hardware and connections for a seamless installation. The BHD3F aims to deliver superior sound and performance.

Specifications

Speaker Specifications:

• Mid Bass Driver: 6.5" (165mm) with poly injection cone and rubber surround.
• Tweeter: 1" (25mm) Polymer dome tweeter.
• Crossover network: Built-in.
• Impedance: 4 Ohms.
• Power Handling: 150W MAX.
• Frequency Response: 105Hz - 20kHz.
• Sensitivity: 91dB (1 watt/1 meter).
• Dimensions: 6-9/16" (W) x 2-5/8" (H) x 6-9/16" (D) (167mm x 66mm x 167mm).

Amplifier Specifications:

• Type: 4 Channel Class D Amplifier.
• Dimensions: 8-3/8" (W) x 1-5/8" (H) x 4-1/4" (D) (212mm x 40mm x 108mm).

Note: All specifications are subject to change without notice.

What is Included?

Before beginning installation, verify that your system contains the following contents:

Speaker Install Kit Contents:

• [Part 1]: HD Street Glide Grills (x2)
• [Part 2]: HD Tour Pak Grills (x2)
• [Part 3]: HD Road Glide Grills (x2)
• [Part 4]: BOSS Audio 6.5” Speakers (x2)
• [Part 5]: Speaker adapters (x2)
• [Part 6]: EVA for speaker adapter (x2)
• [Part 7]: Screw bag for speaker (contains 8x 4x25mm screws)
• [Part 8]: Screw bag for speaker adapters (contains 3x 5x25mm screws)

Important: Over-tightening mounting fasteners may damage your motorcycle. Refer to your service manual for proper procedures and torque specifications. BOSS Audio is not responsible for damage resulting from improper installation techniques. This kit may not be compatible with some aftermarket head units.

Getting Started

1. Protect all painted surfaces.
2. Remove the seat and disconnect the negative battery terminal.
3. For 2009 and later models, it is recommended to remove the two T40 bolts, the ECM, and the tray.

HD Front Speaker Installation

1998 – 2013 Street Glide / Batwing Models:

1. Cover the front fender.
2. Remove two (2) T-27 Torx bolts from the inner fairing, located under the mirrors.
3. Remove two (2) T-27 Torx bolts from the outer edges of the inner fairing near the fork tubes (facing forward).
4. Remove three (3) T-27 Torx bolts from the bottom edge of the windshield.
5. Note: The windshield and fairing will become loose after removing these screws. Exercise extreme caution to avoid damaging the fairing or windshield. Lift away and unplug the headlight to remove the outer fairing.
6. Remove the windshield, being cautious as the outer fairing is now loose.
7. Lift away and unplug the headlight to remove the outer fairing.
8. Remove the remaining speaker screws and the speaker. Continue to kit assembly by loosening six (6) T-25 Torx bolts from the bottom, middle, and top of the left and right sides of the inner fairing.

2014 – 2020 Street Glide / Batwing Models:

1. Cover the front fender.
2. Remove two (2) T-27 Torx bolts from the inner fairing, located under the mirrors.
3. Note: The windshield and fairing will become loose after removing these screws. Exercise extreme caution to avoid damaging the fairing or windshield. Lift away and unplug the headlight to remove the outer fairing.
4. Remove the windshield, being cautious as the outer fairing is now loose.
5. Lift away and unplug the headlight to remove the outer fairing.
6. Remove the remaining speaker screws and the speaker. Continue to kit assembly by loosening six (6) T-25 Torx bolts from the bottom, middle, and top of the left and right sides of the inner fairing.

1998 – 2013 Road Glide / Shark Nose Models:

1. Loosen six (6) T-25 Torx bolts from the bottom, middle, and top of the left and right sides of the inner fairing.
2. Lift away the fairing, unplug the headlights, and remove.
3. Remove the speaker screws and the speaker.

2014+ Street and Road Glide Installation

Speaker Installation:

1. Using three (3) of the provided screws, mount the speaker adapter to the inner fairing. The fourth inner bottom screw location is not used on FLH/Batwing models. For Road Glide models, rotate the adapter until the notches do not interfere with the factory mounting posts, and ensure the flat spots on the adapter's outside face toward the outer edge of the fairing.
2. Mount the new speaker using the hardware provided with the speakers. Do not reuse factory screws. (Refer to Figure B for visual guidance). For Roadglide and Sharknose models, a longer screw may be needed for the lower mounting hole depending on the new speaker.

Amplifier and Amp Plate Installation

1998 – 2013 FLH/Batwing Models:

BHD34 Amplifier Mounting Plate Kit Contents:

• [Part 1]: Ultra Classic Street Glide and Tri Glide bracket (x1)
• [Part 2]: Road Glide mounting bracket (x1)
• [Part 3]: Road Glide mounting bracket (x1)
• [Part 4]: Universal Amp mounting plate (x1)
• [Part 5]: Road Glide Amp mounting bracket (x1)
• [Part 6]: Front speaker input for the Amplifier (White/Black) (x1)
• [Part 7]: Front speaker input for the Amplifier (Gray/Black) (x1)
• [Part 8]: Input from Amplifier front (x1)
• [Part 9]: Output from Amplifier front (x1)
• [Part 10]: Remote wire and pin (x1)
• [Part 11]: Power/Ground harness (x1)
• [Part 12]: Rear speaker input/output harness (x1)
• [Part 13]: Rear speaker connector (x2)
• [Part 14]: Screw Bag (x1)
• [Part 15]: Nylon spacers (x4) + Double sided tape (x4)
• [Part 16]: Wire Zip Tie Wraps (x8)

BPS400.4 4 Channel Class D Amplifier Contents:

• [Part 1]: Amplifier (x1)
• [Part 2]: Remote wire (x1)
• [Part 3]: Front output harness (x1)
• [Part 4]: Rear output harness (x1)
• [Part 5]: Front input harness (x1)
• [Part 6]: Rear input harness (x1)
• [Part 7]: Wrench (x1)

Step 1 - Mounting Plate and Bracket Mounting

With the front fairing removed, use the Type(4) bracket. Align the bracket on the bottom side of the mounting plate using the bracket type indicators. On the top edge, screw in the two threaded pins into the mounting plate. These pins are used to align the mounting plate with the rubber bushings on top of the factory radio.

2014 & Up - Street Glide Mounting:

Diagram Description: Shows the mounting plate, aluminum heat sink, double-sided tape, nylon spacers, and screws. The diagram illustrates how the plate and heat sink are assembled using screws, tape, and spacers.

2015 & Up - Road Glide Mounting:

Diagram Description: Shows the mounting plate, aluminum heat sink, bracket (Type 5), and screws. The diagram illustrates the assembly of the bracket to the mounting plate and heat sink using screws.

HD Street Glide 98 – 13

Step 2 - Mounting Plate and Bracket Mounting:

Using the Type(1) and Type(4) brackets, align the bracket on the bottom side of the mounting plate using the bracket type indicators. On the top edge, screw in the two threaded pins into the mounting plate. These are used to align the mounting plate with the rubber bushings on top of the factory radio.

1998 & 2013 - Street Glide Mounting:

Diagram Description: Illustrates the assembly of the mounting plate with a threaded rod, aluminum heat sink, bracket, and screws. Shows how the bracket attaches to the plate.

Step 3 - Amplifier Mounting:

Mount the amplifier upside down using the supplied screws to the mounting plate. Align the amplifier to the appropriate holes on the plate.

HD Road Glide 98 – 13

Step 2 - Mounting Plate and Bracket Mounting:

Using the Type(2), Type(3), and Type(4) brackets, align the bracket on the bottom side of the mounting plate using the bracket type indicators. After attaching the bracket to the mounting plate, remove the clutch side fairing bulkhead nuts. Place the bracket over the studs, pushing the bracket upwards while tightening down using the factory hardware.

1998 & 2013 - Road Glide Mounting:

Diagram Description: Shows the mounting plate, aluminum heat sink, screws, and brackets. Illustrates the attachment of brackets to the mounting plate.

Step 3 - Amplifier Mounting:

Mount the amplifier upside down using the supplied screws to the mounting plate. Align the amplifier to the appropriate holes on the plate.

Amplifier Wiring

Once the amplifier is mounted, connect the wiring harnesses to their appropriate sockets. Plug the switched power harness into the 2-pin amplifier connector on the throttle side of the fairing.

Note: Ensure harnesses are plugged into the correct sockets. The 4-pin Molex plugs for the Input/Output Harnesses fit on either side of the amplifier.

Diagram Description: Shows the amplifier's connection terminals (PWR, SPEAKERS, HIGH INPUT, LOW INPUT) and the corresponding wiring harnesses. It details connections for speakers (Front/Rear, L/R, Bridged), power (B+, REM, GND), and input signals. It also shows high-level input connections and a connection to the battery with positive and negative terminals.

Fairing Speaker Wiring

1. Unplug the factory speaker wires from the existing speaker and plug them directly into the Front Speaker Input Harness. These are labeled for clutch and brake sides.
2. Connect the new Front Speaker Output Harness to your new speaker terminals.
3. Route power/ground wires through the fairing.
4. Install rear speaker wires by feeding the Rear Speaker Input/Output Harness through the fairing towards the rear of the speaker.

Routing Power Harness / Rear Speaker Harness

1. Pass the Power/Ground Harness and Rear Speaker Harness through the fairing, routing them alongside the factory wiring harness. It is recommended to bundle the new harnesses with the factory harness.
2. Secure the harnesses together using zip ties for a clean, tight fit.
3. Due to the wire gauge of the Power/Ground Harness and Rear Speaker Harness, it is recommended to route the wiring under the gas tank, along the top of the motorcycle frame.
4. Note: Refer to the motorcycle manufacturer's owner's manual for instructions regarding gas tank removal.

Rear Speaker Installation

With the seat removed, route the Rear Speaker Harness towards the rear of the motorcycle, over the fender, and along the brake side of the motorcycle. Unplug the factory speaker wires from the speaker and plug them directly into the Rear Speaker Input/Output Harness. These are labeled for clutch and brake sides.

Amplifier and Amp Plate Installation (2014 – Newer Models)

Street Glide FLHT/Batwing Models:

AMP INSTALLATION

*NOTE*: After installation, the vehicle's head unit must be flashed to achieve proper sound from the upgraded system. Please visit the following link to find a recommended HD shop for head unit flashing: https://technoresearch.info/tuning-centers-map/

If you have a 2020 Street or Tri Glide, complete the following steps before amplifier installation:

• Remove four screws from the HD Connect Module.
• Remove the Module from its Bracket.
• Relocate the Module to the clutch side of the radio and secure it with two 8" zip ties.

NOTE: Some connectors may need to be relocated from the radio chassis to accommodate the amplifier bracket.

1. Fasten the amplifier to the bracket using the supplied hardware. Insert bolts through the bottom of the bracket and install locknuts onto the amplifier.
2. After completing system setup, use the supplied hardware to fasten the amplifier/bracket assembly to the radio chassis, ensuring the 10-pin connector and power connector face the throttle side.

HARNESS INSTALLATION

1. Plug the harness into the amplifier and route the speaker wires to their respective connectors. Separate the speaker connectors and plug the amplifier harness into each speaker.
2. Important: Over-tightening mounting fasteners may damage your motorcycle. Refer to your service manual for proper procedures and torque specifications. BOSS Audio is not responsible for damage resulting from improper installation techniques.
3. Plug the switched power harness into the 2-pin amplifier connector on the throttle side of the fairing.
4. Connect the supplied blue wire from the BOSS Audio Amplifier kit to the switched power harness lead with one wire. This provides an accessory 12V port.
5. Route both power leads along the clutch side of the frame neck, through the electrical caddy, to the seat area.
6. Reconnect the battery terminals. Pull excess harness slack back into the fairing, creating a slack loop.
7. Plug in the radio, but do not reinstall it until the gain has been set.
8. Test component function and set the gain to optimize system performance.
9. Carefully reassemble the motorcycle and enjoy your new audio kit.

Road Glide FLTR 2015 – Newer Models:

AMP INSTALLATION

*NOTE*: After installation, the vehicle's head unit must be flashed to achieve proper sound from the upgraded system. Please visit the following link to find a recommended HD shop for head unit flashing: https://technoresearch.info/tuning-centers-map/

1. Remove the radio. Unplug the four connectors on the back of the radio. Remove the four Allen head bolts securing the radio to the chassis. Gently remove the radio from the chassis.
2. Install the BOSS Audio amplifier onto bracket Type(4) using the supplied hardware. Slide the amplifier's end with the power connector port into the bracket and fasten with supplied hardware. Install bolts from the bottom and fasten locknuts onto the amplifier.
3. Carefully install the bracket/amplifier assembly onto the radio chassis. Insert the assembly through the radio face port in the fairing and slide the bracket's tabs over the chassis. The amp bracket assembly mounts under the radio.

HARNESS INSTALLATION

1. Plug the harness into the amplifier and route speaker wires to their respective connectors. Separate the speaker connectors and plug the amplifier harness into each speaker.
2. Important: Over-tightening mounting fasteners may damage your motorcycle. Refer to your service manual for proper procedures and torque specifications. BOSS Audio is not responsible for damage resulting from improper installation techniques.
3. Plug the switched power harness into the 2-pin amplifier connector on the throttle side.
4. Connect the supplied blue wire from the BOSS Audio harness into the switched power harness lead with one wire. This provides an accessory 12V port.
5. Route both power leads along the clutch side of the frame neck, through the electrical caddy, to the seat area.
6. Reconnect the battery terminals.
7. Plug in the radio, but do not reinstall it until the gain has been set.
8. Test component function and set the gain to optimize system performance.
9. Carefully reassemble the motorcycle and enjoy your new audio system!

Wiring Diagram

This wiring diagram is for a standard 4-Channel amplifier installation. If using a 2-Channel amplifier, DO NOT use the Rear Input/Output Harness.

This kit is ready to plug directly into 2014 & Up Harley-Davidson Motorcycles using factory-style connectors. For installation on 1998-2013 motorcycles, use the wire connector adapters to connect to the factory wire harness and new speakers.

Diagram Description (FRONT): Shows connections for Clutch Side and Brake Side front speakers. It illustrates the Front Speaker Input Harness and Front Speaker Output Harness connecting to the speakers and the amplifier. It also shows the REM (Blue) 2014 & Up Remote Wire.

Diagram Description (REAR): Shows the Rear Speaker Output Harness and Rear Speaker Input Harness connecting to rear speakers. It also depicts the Power Harness connecting to the battery ([Positive terminal] and [Negative terminal]) and the amplifier. Input Harnesses (Clutch and Brake) are shown connecting to factory speaker wires.

Contact Information

BOSS Audio Systems
3451 Lunar Court - Oxnard, CA 93030
www.bossaudio.com
Customer Service: 805-751-4853
Tech Support: www.bossaudio.com/support

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