@Bengalfan is right. You have to find where the handle bar wiring harness connects to the main wiring harness, disconnect them, and reconnect with the SPI in the middle.
I just helped my buddy put a tether on his 2014 M8000, said connector was found just in front of the gas tank. We had to pull the panels, hood, console, and unbolt the gas tank to slide it back a few inches. Tedious, but not hard.
On earlier models I think the connector is much more accessible, just behind the driven clutch.