If the battery starts the vehicle after 5 or 10 minutes of being disconnected, chances are there is a bad connection at the battery or the ground at the engine block. Is everything in good condition?
On the flip side, a bad diode in the alt will drain a battery overnight, but it would require a jump start to start again. Your battery really isn't dead. When this happens again, use a volt meter to check to see how much power there is from the battery. Also, have a helper turn the key to the start pisition to see if the battery drops off. When doing this, make sure you have a good connection at the battery post not the terminal cable.
Let me know what you find.
Monday, April 20th, 2009 AT 4:57 PM