I used this on my 2015 F-150. I have a 12V/35Ah gel cell plugged into a cigarette lighter socket. I used this as a power source. The Ready indicator on the device will only light up after it is connected to the OBD-II port. I plugged it into the truck, closed the door and made sure the dome was off. Then I changed the battery. I disabled the memory splash screen and all my navigation and radio settings remained. Is it worth the money to me?
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