I installed an XM Myfi into my ML today, powering it off the 12V outlet under the dash. However, this outlet does not power off when the ign is turned off so I am afraid of forgetting to turn off the XM and having it run down my battery. I did change a setting in the Myfi unit for delayed power off after an hour, but still have to turn nit off and on manually. It has a sensor in it for switched outlets so that it comes on and off with the car, however my ML never switches off the outlet so that feature doesnt work. Is there an easy way to change this (maybe dealer programming option) or would it require rewiring it into some other switched circuit? Thanks!