Quote Originally Posted by Toofastgs View Post
Your cars electrical really mainly runs off the battery. Alt is to charge the system
Incorrect. When the engine is running the alternator is powering all systems at around 14.4V.

The battery is a 12V battery so it just sits there getting charged. It's potential is not enough to make it a power source in a 14.4V system, only a draw to be charged.

If the battery is what powers things, why can I take the battery out of a running car and it doesn't even notice?