Does the 12v port automatically shut off?
I'd like to put my XM radio in my wife's 2001 ML320, but I'm pretty much convinced she'll never remember to unplug the power cord from the 12v socket. My Suburban automatically shuts the socket off after 15 minutes so the battery doesn't run down. Does the ML320 have a similar feature? Failing that, where's a good place to tap into ignition-on-only power? I looked under the dash, and there's not anything overtly apparent there.
Any help would be appreciated....
- JohnnyGeek