The stereo and speakers is a 4 ohm system so that may be the reason why the 665 won't integrate. You may have to upgrade your sound system including speakers to a 2 ohm set up to get things to integrate. Upgrading the sound system to a 2 ohm system should give you a lot better sound at riding speeds as well.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.