I'm going to get a RAM mount and put a GPS on my bike, but my TOMTOM currently doesn't last longer than two hours without a charge. So I am also going to hook up a usb wire with a relay. I've never done any electrical work before, so I am wondering how people have their relays and fuse blocks setup for their electronic accesories.
Also, what switched power source are you running the relay off of? I would preferably be interested in something that is non-essential, but I know the GS is minimalist so that will be difficult to do.
So if you could just write about your setup and experiences that would be great!
12v "cigarette lighter" adapter wired into the orange wire. That's it. (Oh, I do have the Battery Tender cable on the battery, so I might use that SAE connector and run a wire into a tail bag some day)
I just hook mine up to the battery tender cable. If I used a gps constantly I'd consider hard wiring it to my bike, but I don't, and the battery tender cable is already hooked up to my battery so I just bought a USB plug off of someone on this forum, not sure if she's still selling them or not. You can buy them online also. Then I wired up the other end to another SAE plug. I happened to have a spare battery tender cable I cut up, but you can get them at pepboys or any car store. Just look in the section with all the trailer wires and extensions. They sell SAE extensions with 2 plugs for about $2, just cut it in half and wire one up. They're wired opposite from each other so make sure you test it out before you solder it up.
EDIT: just for reference, you can do the same with a cigarette lighter adaptor, I just liked the USB because it's smaller.