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There is a black rubber “foot” in the kit. On 2006+ Ultras, the CB module is mounted on 

top of the radio on the clutch side. The foot is used to fill the void next to the CB, so when 

installed, the amplifier has ample support. On 1998-2005 bikes, or 2006+ bikes with the 

CB and XM modules, or 2006 bikes with the CB removed, the foot is not used. See the 4 

options below, and pick the one for your bike to prepare the amp to be installed in place.

Review the 4 options below, and pick the option best suited for your bike to  

prepare the amp to be installed in place.

1)    

If you have an 06+ Ultra with the CB as shown in Diagram 1.1

, the foot 

will be installed using supplied screws to the 2 holes on the bottom of the “brake side” 

of the amplifier. The foot has an angle cut in it so it will clear the outer fairing going 

back on. Make sure the angled portion of the foot sits adjacent to the angled part of 

the amp. Place one  side of the supplied “hook and loop” adhesive on the CB Module, 

trimming it to fit if you like, and the other side of the “hook and loop” adhesive on the 

underside of the amplifier. Place the small piece of “hook and loop” adhesive between 

the screw holes on the underside of the foot.  This helps the amp sit level when properly 

installed. Please note that most adhesives work best at room temperature or higher and 

on clean surfaces.  Put the amp in place. There is an “overhang” built into the foot. The 

amp is far enough back when the overhang meets the back of the radio. 

2)   

If you have an 06+ with the CB AND XM Module , or a 98-05 Ultra

. place 

one side of the supplied “hook and loop” across the CB Module,/XM Module or across 

the top of the 98-05 radio, and the other side of the “hook and loop” adhesive on the 

underside of the amplifier. Please note that most adhesives work best at room tempera-

ture or higher and on clean surfaces.  Put the amp in place so the back of the amp is as 

close to the back of the speedo/tach as possible, or the outer fairing will not go back 

on.  

3)  

 If you have a 2006+ with no CB (or XM) module

 you will notice a “bump that 

runs from the front to the back of the radio in the center. Take one side of the hook and 

loop adhesive, cut it in half, and place each half on either side of the bump. Place the 

other side of the “hook and loop” adhesive on the underside of the amp.  Please note 

that most adhesives work best at room temperature or higher and on clean surfaces. Put 

the amp in place so the back of the amp is as close to the back of the speedo/tach as 

possible, or the outer fairing will not go back on. 

4)  

 If you have a Road Glide.

 You will mount the amp using the instructions that came 

in your RG 40.4 Adaptor Kit. Once the amp is in place with the harnesses all plugged 

into the amp, you can move to the next step.

Note: If wiring to speakers other than Hogtunes, the smaller  

connector on Hogtunes products is always positive (+)

AMP PREPARATION

WIRING THE AMPLIFIER

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Step #1:   With amplifier in place, take the yellow/black wires on the input connector of 

the amplifier, and plug them into the front factory speaker wires on the clutch 

side of the bike. They will only go in one way. Take the brown/black wires on 

the “front out” connector and plug them into the front clutch side speaker.  

Step #2:   Take the green/black wires on the input connector and plug them into the front 

factory speaker wires on the brake side of the bike. Take the blue/black on the 

front out plug, and plug them into the brake side front speaker. 

  

 The orange wire on the power harness is the “remote turn on lead” and tells the 

amp to turn on whenever it sees +12v (.5 amp min.). Unplug the center wire (+) 

on the cigarette lighter. Plug the orange lead from the amplifier directly onto the 

lighter using the female connector. Plug the factory lighter wire to the male “take 

off” connector which is part of the amps orange turn on lead.

ROUTING THE POWER WIRE HARNESS

Step #1:   The power/ground harness and rear harness (if used) will pass together under 

the inner fairing where the main wire harness passes through on the brake side 

of the bike. Loosen the tanks “chrome console” and run wires up and over the 

gas tank, but under the tanks chrome console. There is a provision on the front 

of the tank console for wires to pass.  

Stock Harness and Amplifiers  

Harnesses Passing From Fairing To 

Just In Front Of Tank 

(Arrow A)

.  

 

Cable Tying the 2 Amp Harnesses To 

The Main Bike Harness Just In Front 

Of The Tank 

(Arrow B)

 Allows The 

Amp Harnesses To Go Up Towards 

The Tanks Chrome Console Easier 

And Makes For a Cleaner Install. 

 

When correctly installed, the power and ground wires are the right length to connect to the 

battery, and if used, the rear wire 8 pin harness is the right length to be zip-tied to the clutch 

side fender strut. Be sure to run the 8 pin harness 

UNDER

 the air line for the clutch side 

rear shock.

B

A

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