Q&A: Car Gadgets Run off Battery when engine running?

Question by GoodShepherd: Car Gadgets Run off Battery when engine running? When your car engine is running and you plug a GPS or such into your cigarette lighter or adapter does the power run directly off of your car battery? I know that happens when your car engine is not running, the power comes from your battery, but I always thought that when your car engine is running, everything runs off the power your engine generates. However this past week on Clark Howard I he said he was wondering why…