Two weeks ago I bought a new Garmin 665 to use on my RT. I hard wired the power to my Centech fuse panel and the Garmin unit always works and charges without issue. The problem that I'm having is with the GXM40 antenna. From the start 25% or so of the time I would get "Check XM Antenna" when I pushed the music button after startup. After fiddling with the connection under the seat most, but not all of the time I could turn the unit off and then back on and I would get XM music and weather alerts as normal. I was trying to figure out what would cause such an intermittent problem?
At first I thought that it could be a power related issue. I tried turning off my auxiliary lights and making sure everything was off when I first started the bike. But I still got the random message "check XM antenna" about the same 25% of the time. Sometimes when riding I could turn off the unit and turn it back on and it would work. Finally on my way home from Colorado yesterday, after using XM for 3-4 hours without issue I stopped for lunch. After that I could not get it to work at all. For 400 miles I tried turning the unit off and on and it would always say "check XM antenna". I finally gave up.
I'm thinking that the GXM 40 antenna must be bad? Or wiring it through the Centech fuse panel is the problem? Any ideas?