Diamond Audio HXM Stage 2 Installation Guide | 2015-2023 Road Glide

Diamond Audio HXM Stage 2 Bundle Installation Guide

2015-2023 Harley-Davidson Road Glide

Please follow these installation tips when you're ready to install your new Diamond Audio HXM Stage 2 Bundle.

Important: Before proceeding with the installation, please watch the video linked here. It covers important modifications required for your Road Glide.

Tools Needed

• Plastic panel removal tool
• T25 Torx bit
• T27 Torx bit
• 3/16" Hex bit
• 1/8" Hex bit
• Ratchet wrench
• Fender cover or soft towel
• Heat gun
• Small flathead screwdriver
• Zip ties

Step 1: Remove the Outer Fairing

1. Use a plastic panel removal tool to carefully remove the speaker grilles. Start near the handlebars.
2. Remove the T27 bolt located beside each speaker.
3. Remove the T27 bolt located at the lower outer edge of the fairing.
4. Remove the turn signal mounting screws using a 3/16" hex bit.
5. Cover the front fender with a towel or fender cover to protect the paint.
6. Remove the four windshield mounting screws using a 1/8" hex bit.
7. Remove the windshield.
8. Pull straight up on the fairing vent to release the retaining clips.
9. Disconnect any wiring attached to the outer fairing.
10. Carefully remove the outer fairing and set it aside.

Step 2: Remove the Factory Speakers

1. Remove the four T25 screws holding each factory speaker in place.
2. Disconnect the speaker wiring connectors.
3. Please watch the video linked here before you proceed with installation.
   1. Using a heat gun, gently warm the inside of each speaker pod.
   2. Once the plastic softens, remove the factory interior fins from the pod.

Tip: Keep the heat gun moving to avoid overheating the plastic.

Step 3: Install the Diamond Audio HXM 6.5" Speakers

1. Connect the 1/4" and 1/8" spade connectors to the matching terminals on the HXM speaker.
2. Connect the supplied speaker pigtail to the factory wiring inside the speaker pod.
3. Connect the RGB harness plug to the RGB port on the speaker.
4. Route the RGB harness between the speaker and speaker pod at the bottom (6 o'clock position).
5. Place the speaker into the speaker pod and align the mounting holes.
6. Install the supplied black Phillips-head screws.
7. Start all four screws by hand before tightening.
8. Route the RGB harness toward the upper center area of the fairing.

Note: Leave enough slack in the RGB wiring so it can easily reach the RGB controller during a later step.

Step 4: Remove the Factory Radio

1. Remove the two T25 screws securing the radio support bracket.
2. Disconnect all wiring from the back of the radio.
3. Press the release tabs before unplugging each connector.
4. Remove the four 3/16" hex bolts securing the radio.
5. Save these bolts for reinstallation.
6. Lift the radio upward and forward to remove it.

Step 5: Mount the Amplifier and RGB Controller

The amplifier can be mounted using one of the following methods:

• Included Velcro squares
• Included Velcro sheets
• Screws mounted directly to the plate

1. Choose your preferred amplifier mounting method.
2. Mount the amplifier to the supplied amplifier bracket.
3. Use the supplied Velcro strips to mount the RGB controller near the amplifier.
4. Depending on any existing accessories, you may need to choose a mounting location that still allows the outer fairing to be reinstalled.
5. Connect the RGB harness from each fairing speaker to the RGB controller.

Tip: Before permanently mounting the RGB controller, verify there is adequate clearance behind the outer fairing.

Step 6: Install the Amplifier Mounting Plate

1. Remove the four T25 screws from the fairing support plate.
2. Position the supplied amplifier bracket beneath the support plate.
3. Ensure the rear lip of the bracket slides over the support plate crossbar.
4. Align all four mounting holes.
5. Install the supplied nuts and bolts.
6. Start all hardware by hand before tightening.

Step 7: Reinstall the Radio

1. Place the radio back into its factory location.
2. Loosely install the four original 3/16" mounting bolts.
3. Connect the factory USB cable.
4. Connect the factory AM/FM antenna.

Do not fully tighten the radio yet.

Step 8: Install the MSTLINK Harness

Factory Head Unit Installation

1. Insert the MSTLINK male connector into the rear of the radio.
2. Connect the MSTLINK female connector to the motorcycle's factory wiring harness.
3. Connect the 4-pin Molex connector with RCA cables labeled Front Left and Front Right to the amplifier's Front Input.
4. Connect the 4-pin Molex connector with White and Gray wires to the amplifier's Front Output.

VOX Turn-On Option: The amplifier can be set to signal-sensing mode. The amplifier may remain on for 30–60 seconds after the motorcycle is turned off.

Remote Turn-On Connection

1. Connect the blue wire 2-pin white connector to the matching black factory connector near the clutch-side speaker pod.
2. Connect the larger black connector with the yellow, blue, and black wires to the matching connector on the wiring harness.
3. Connect the wire labeled Accessory+ to the amplifier REM terminal and tighten using a 2mm Allen wrench.

RGB Controller Power Connection

1. Locate the accessory harness pre-wired to the RGB controller.
2. Connect the accessory harness to the MSTLINK harness.
3. Connect the solid blue wire with the white connector to the factory accessory power connector located on the clutch side of the motorcycle.

Note: This connection provides switched accessory power for the RGB controller.

Aftermarket Head Unit Installation

1. Insert the MSTLINK male connector into the rear of the radio.
2. Connect the MSTLINK female connector to the motorcycle's factory harness.
3. Use the supplied RCA cables to connect the head unit to the amplifier inputs.
4. Connect the RCA end labeled "To Source" to the RCA outputs on the radio.
5. Connect Red to Red and Clear to White.
6. Connect the opposite end to the RCA-to-Molex adapter.
7. Connect Red to Red and Clear to Clear.
8. Connect the 4-pin Molex connector with White and Gray wires to the amplifier's Front Output.
9. Connect the supplied remote turn-on wire.
10. Connect the bullet connectors together.
11. Insert the ferrule end into the REM terminal on the amplifier.
12. Tighten using a 2mm Allen wrench.

RGB Controller Power Connection

1. Connect the accessory harness pre-wired to the RGB controller to the MSTLINK harness.
2. Connect the solid blue wire with the white connector to the clutch-side factory accessory power connector.

Step 9: Run Power and Ground Wiring

Remove the Seat and Fuel Tank

1. Remove the seat.
2. Remove the ECU plate above the battery using the T40 bolts.
3. Disconnect the ECU connectors.
4. Remove the front and rear fuel tank mounting bolts.
5. Disconnect the fuel line by sliding the collar upward and pulling downward.
6. Disconnect the vent hoses.
7. Carefully remove the fuel tank.

Tip: Keep a towel nearby to catch any fuel drips.

Route Power and Ground Wiring

1. Remove the wire chase cover.
2. Remove the 60-amp fuse from the inline fuse holder.
3. Route the power and ground wires through the wire chase.
4. Route the wires up the clutch side into the fairing.
5. Connect the red wire to the amplifier's 12V input.
6. Connect the black wire to the amplifier's Ground terminal.
7. Tighten both connections using a 2mm Allen wrench.
8. Use zip ties to secure the wiring inside the wire chase.
9. Connect the power wire to the positive battery terminal.
10. Connect the ground wire to the negative battery terminal.
11. Reinstall the 60-amp fuse.
12. Secure any excess wiring.

Step 10: Test the HXM Stage 2 Bundle

Set Up the RGB Controller

1. Download the Magic Lantern app from your device's app store.
2. Follow the in-app instructions to pair the RGB controller with your phone.
3. Verify both front speakers illuminate properly.
4. Test multiple colors and lighting modes to confirm operation.

Adjust Amplifier Settings

1. Turn the motorcycle ignition on.
2. Allow the radio to power up.
3. Play music that will continuously play for several minutes.
4. Set the radio volume to approximately 75% of maximum volume.
5. Using a small flathead screwdriver, adjust the Front Gain control until the desired speaker volume is reached.
6. Make any desired EQ adjustments using the head unit.

Important: Avoid setting the gain too high. If you hear distortion, reduce the gain immediately.

Step 11: Reinstall the Outer Fairing

1. Reinstall the black radio support bracket using the two T25 Torx screws.
2. The curved portion of the bracket should face upward.
3. Position the outer fairing back onto the motorcycle.
4. Temporarily install one windshield bolt to help hold the fairing in place.
5. Reconnect any wiring harnesses disconnected during disassembly.
6. Reinstall the turn signal mounting screws using the 3/16" hex bit.
7. Remove the temporary windshield bolt.
8. Reinstall the fairing vent.
9. Reinstall the windshield and the four windshield mounting bolts.
10. Reinstall the lower fairing T27 bolts.
11. Reinstall the T27 bolts located near the speakers.
12. Install the supplied Diamond Audio speaker grilles.

Final Inspection

• Verify both front speakers are operating properly.
• Verify RGB lighting functions correctly on both speakers.
• Confirm the Magic Lantern app communicates with the RGB controller.
• Verify amplifier power and ground connections are secure.
• Verify all wiring is properly secured with zip ties.
• Ensure no wiring can be pinched by the seat, fuel tank, or fairing.
• Confirm all fairing and windshield hardware is tightened.
• Verify both audio and lighting functions before riding.

Congratulations! Your Diamond Audio HXM Stage 2 Bundle installation is now complete.