To me seems like I could just tap the wire for the outlet. In my own testing I removed the plug on the rear of outlet and slid the positive wire and connected the ground to the battery and when the key is turned the Zumo turns on. But when the key is turned off it does not power down because BMW set the outlet up to work with their tender via turning the key on and then making connection and shutting key keeping power to the battery for charging so I guess the bike is thinking something similar with the GPS.
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