Plug & Play Signal Adapter for Aftermarket Amplifier 14+ SKU: WH-14-PNP-F



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This is the simplest and best way to get a signal from your factory Harley radio when installing an aftermarket amplifier.

Product Description

Radio Flash & DSP
It is highly recommended that you either have your radio flashed by an independent bike shop with the proper equipment or you use one of our digital sound processors in conjunction with this part. The factory Harley radio is programmed from the factory with a radical EQ curve that is not friendly for aftermarket speakers and amplifiers.  

Technoresearch has a number of flashes that its software offers. These flashes are all supplied to them by a number of aftermarket amplifier manufactures, but we recommend using the one from Rockford Fosgate. This particular flash has a friendly EQ curve for aftermarket amplifiers and speakers. It also enables rear speakers, front-to-back fader (not all flashes do), bass and treble controls, and speed-dependent volume feature. 

We Have Simplified This Process
By offering a Rockford Fosgate sound processor bundled with this product that has a pre-programmed counter EQ for the Harley radio. This eliminates the need for you to have your bike flashed. You can find these kits here.

Additional Speaker Pod Connectors
This kit also comes with connectors that mate to your fairing speaker pods. This way you can connect your aftermarket amplifier directly into your fairing speaker pods without any cutting or splicing into the bike's wire harnesses. We always recommend using speaker pod connectors along with our signal adapters.

Note: If you are purchasing this item for rear signal only you will not need the optional speaker pod connectors and they will not be in your kit. Speaker pod connectors are only used for front fairing applications. Rear kits do however come with an adapter that makes them compatible with the rear radio outputs. 

Front or Rear Signal
This kit comes ready to plug directly into the front signal harness of the factory radio on all Harley touring bikes. Optionally we offer a rear signal version that plugs in and converts this adapter to fit the 4 pin connector that Harley uses for the rear channels on 4 channel bikes. 

Rear Channel Tech Info
All two-channel bikes (90% of all bikes sold) have a rear speaker output connector located behind the factory radio. This plug however is dead (no signal) unless the radio is programmed for 4 channel output. 

Programming for Rear Channel Output Tips
Harley has many radio configurations that can be flashed to the radio by the dealership or an independent bike shop. The factory Harley flashing system that all Harley dealerships have is capable of flashing your bike for 4 channel output but that is not our first recommendation because none of the Harley configurations are designed for aftermarket amplifiers. There are a series of limitations to the factory flash system. Our recommendation is to find a shop that has the Technoresearch brand flash tool. This is the most popular tool on the market and many Harley dealerships have it as well.


  • Compatible Year - 2014+
  • Compatible Model - Street Glide, Road Glide
  • Location - Fairing
  • Additional Adapter Required - No 
  • Modification Required - No
  • Plug & Play - Yes
  • Works with Electric Lid Locks - N/A

Note: This unit is intended to be used with aftermarket amplifiers only. It Will Not work with the factory amplifier(s). This is not high to the low converter. This unit outputs a speaker-level audio signal with an RCA-type connector. Most all modern amplifiers for use with motorcycle applications are designed to accept speaker-level input at the RCAs. Be sure to verify that your amplifier has this feature. If not, a high to low-level adapter must be used in conjunction with this part. Call if you have any questions about this. We can verify for you that your amplifier does or does not have speaker-level inputs if you are not sure. 

This kit connects to the front signal harness of the factory Harley radio with plug & play connectors and outputs to your aftermarket amplifier or DSP and includes an integrated circuit that balances the factory Harley radio outputs. This results in a much wider volume range without the distortion that you would otherwise end up with. 


5 years


Road Glide

Street Glide

What's Included

(1) Plug & Play Signal Adapter