I note there are numerous topics on 12v battery problems with older FFHs. Rather than add onto one of those, I'm starting a new one because I'm experiencing similar problems on a 2017 FFH that we've had for 6 weeks and <1,200 miles. The 12v battery has died on us twice. First time after the car sat for 48 hours. We took it to the dealer who said that it was a bad 12v battery and replaced it. Now, about four weeks later, the new battery was dead, this time after the car sat for 24 hours. When I tried to start it, a clicking noise began in the fuse box and the red light on the gear selector knob blinked, but the dashboard did not light up, the car did not start and the clicking continued without stop until I jumped started the car. After jump starting, it ran fine, but the audio system is inoperative and the navigation system shows no GPS connection. It's Sunday evening, so I will take it back to the dealership first thing tomorrow AM.
Has anyone had similar experience with a new 2017? It seems HIGHLY improbable that we would get two bad 12v batteries in a row. What might be draining the battery after the car is shut off?