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I have a 2007 K1200LT on which I have had problems with my previous Garmin Zumo 550 and my new Zumo 650. I had the units connected to the radio using connections to the original BMW GPS wiring harness which worked with my original Street Pilot. The problem was that when I hit the break (lever or pedal) I got a humming on my headset at the same time as the radio cut out - similar to vox when talking on the intercom. I tried just about everything, but I still had the problem.

Finally, as a last resort when I recently had the bike in for service, I had a fuse block and a relay installed and had the GPS wired to the block and not through the BMW Com Unit. Just got the bike back today and on the ride back home (around 45 minutes) I did not experience any problems.

I never had the problem when using the Street Pilot, but as mentioned when I cut the wiring harness to connect the 550 and using the same setup for the new 660, the problem was evident and got worse with time.
 
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