On a genisis radio I had, we had to plug in a audio cord to the tv headset jack, then plug into the aux. Input jack in the radio. Just like connecting your phone to the truck radio. Then use the aux. Input button on stereo to turn on.
But your stereo may be different.
Im sure you will love your HG. They were in our top 3. We really loved the 366bh!
MillerTime- Future Sabre Handler!!