Fuzzy,
Here we go, "as I know it". First off, we have to know the distinction between the Garmin SP III and the 2610. The SP III works on the bike or auto with a 12V hook up, and it has battery backup, so that you can leave the GPS on, when the ignition is turned off. This way, with the GPS on full time during your trip, you can log all your times. Riding, break etc. When you get home, you can look at your ride via the GPS and see the duration of ride time and break time etc. Also, with the battery backup, you can take your GPS into your hotel room, and modify the next days route etc.
On the other hand, the 2610 does not include battery backup. So when you shut your key off, the GPS shuts off as well. For me this is not a problem, as I really am not concerned about ride / stop time. Kennedy has two kinds of harness' for the 2610 as Jon/Kennedy has indicated. The European harness allows for a "HOT" hook up, so that you can continue to manipulate the GPS when the ignition is off.
For the "HOT" hook up, I would not go directly to the battery. Rather, I would hook the harness to the "Electrical Connections Power Block". I am not a big fan of unfused, direct connections to the battery.
I too, am waiting for Kennedy to release the Harness for the 2610. I would imagine that would be either this week or next.
If you are using an SP III, Kennedy already has the plug & Play harness and it works really well and is a snap to install.
If I have confused you further, I apologize. If I have helped clear this up a bit for you, than I am a happy camper.
Bulldog