My 12V died. I was able to jump the 12V and start the screen by pressing the jumper battery repeatedly (jumper stops the charge after 30s but screens need longer than 30s to start up). I scheduled for mobile service tomorrow at my office to get the 12V replaced. I'm hoping to be able to drive the car tomorrow to the office by jumping it. While the screens started up fine, as soon as the last push +30s jumper ends, the car would die again. Is there any way to get the main battery to push juice to the 12V to maintain the charge for the electronics after jumping? Thanks