There are two ways to do this:
The first is to have the Garmin connected to a power source that is only on when the car is on. When the Garmin looses power, it will warn you and wait a few seconds, then power off.
The second is to purchase the Garmin EcoBoost module so that your GPS can detect when the car shuts off. Your Garmin has to be EcoBoost compatable to use this second solution.
SOURCE: My garmin 750 doesn't automatically power on or off anymore.
you must turn it on and off manually
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