I've had my Zumo lead hard wired into a switched circuit as it was draining the battery even when not connected, albeit after a few weeks and only if bike not used. I had this done at the dealers when getting a service done so I'm not sure where it was spliced into and thus not helpful. But, and it's a big but, when I enquired about getting it done the dealer said 'oh we'll splice into the brake wire', but the mechanic said 'no we can't do that due to the bike having ABS, I'll find another circuit'...Be warned, I'm not sure why this could not be done, perhaps something to do with the electrical gubbins that control the ABS.