It took a day to work out install on my HD Pan America 2021 here is what I learned and hope it helps.
The battery leads supplied are not long enough to reach the battery, which is located at the front of the bike behind the skid plate, which you need to remove to access the terminals. I bought red and black wires to the same spec 18AWG, 600v, connectors and heat taping from Amazon https://www.amazon.co.uk/dp/B07WC9P3WH?ref=ppx_pop_dt_b_product_details&th=1https://www.amazon.co.uk/dp/B01N1WWR7E?psc=1&ref=ppx_pop_dt_b_product_detailshttps://www.amazon.co.uk/dp/B09KCK5SZN?psc=1&ref=ppx_pop_dt_b_product_details
Then I extended the wires and wrapped them in the black tape to run up the left side of the bike with the rest of the wiring

The front camera fitted on the left hand wind deflector and you'll see I used the rubber washers to pack it out (just noticed one needs straightening out)

The GPS went inside the deflector and works well in that position

With the front fairing pulled off the wiring runs along the frame to meet the power cables

Then wrap all the wires (power, camera, GPS, remote and in may case Sat Nav) in the black tape to create a wiring loom, which followed the clutch cable under the tank

The loom comes out behind the small heat shield and into the seat compartment.

Rear camera mount

The wire runs under plastic and into under seat compartment
Hooked up the yellow switched to the HD accessory plug (the right in picture one is switched, and taped by me) I've got my sat nav into this with a HD plug and then attached the yellow Garmin wire to the red positive...the switched power

Mic clipped inside compartment but not yet tested....
There is a space behind the mic towards the back of the bike which I put some wiring in. There is plenty of room under the seat to tidy up cables and have the recorder lay on top for easy access.
Some photos of the finished job



Hope this helps you're install take less than the 7 hours it took me!!!
Hi, Tony, sorry for this problem, could you please turn on the ignition only, and leave the K3 work in a silent enviroment, see if the problem persists?
We here awaiting your reply.
Thanks.
Update after a few hundred miles...GPS works a treat in this location as dos everything else except the microphone sound quality...which is poor no matter where placed. Many others have commented on this as it sounds like its underwater...
Hi Tony,
Thanks so much for sharing the pictures and your thoughts, these will definitely help other users, and we really appreciate all your efforts and support.
Have fun and be happy.
Looks great how you mounted everything. Thanks for sharing the info and pictures.
I am also curious what your experiences will be with the GPS reception because you have placed the GPS receiver vertically.
So please let us know how your GPS reception is.
Looks like a very nice and clean installation. Thanks for the pictures and installation hints.