Empty red connector

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Nov 6, 2023 | 11:07 PM

Ken45

Thread Starter

Road Master

Joined: Oct 2022

Posts: 960

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From: USA

Empty red connector

On the left side of my 2021 RK under the side cover. Anyone know what this unused red connector is for?

Nov 6, 2023 | 11:34 PM

RKZen

Seasoned HDF Member

Joined: Aug 2013

Posts: 6,088

Likes: 1,962

From: Somewhere on the Bourbon trail

Diagnostic port.

Last edited by RKZen; Nov 7, 2023 at 12:32 AM.

Nov 7, 2023 | 04:24 AM

DeeRoe

Road Warrior

Joined: Dec 2005

Posts: 1,276

Likes: 1,077

From: SE SC

Techs use it to look at all the electronic innards on the bike...ECM, BCM, ABS, etc.

Also used to tune a bike if you have a FuelPak, PowerVision, etc.

Nov 7, 2023 | 07:37 AM

benscratchin

Seasoned HDF Member

Joined: Oct 2015

Posts: 8,469

Likes: 19,162

From: The Republic of Texas

Both previous answers are correct.

H-D makes a patch cable that plugs into that connector, the other end plugs into the USB port on a computer. With the correct program on the computer, the Bikes ECM can be accessed for tuning, diagnostics, etc.

I have the patch cable, program, and the SE Super Tuner Pro module needed to communicate/tune/monitor what is going on with the ECM.

Keep that connector covered and clean.

.