This may sound elementary, but make sure the battery terminals are clean and tight. Also, check the ground to the engine block to make sure it is clean and tight too.
Finally, if everything is good, check the wiring from the alt to the battery. There is a fuseable link there which may be bad. Check if for continunity.
Let me know what you find.
Tuesday, January 12th, 2010 AT 9:42 AM