Do you have a multimeter you could put on the battery while its running to see what voltage you are getting across the two terminals? Sometimes a bad ground can cause an overcharge condition, sometimes its a bad voltage regulator in the alternator. Many times these can be replaced pretty cheaply and without too much effort if you can get to the back of the alternator. You will need to see what voltage you have though at the battery. The charging voltage should be between 12.8V and 14.7V with the car running.
Charles
'04 Volvo XC70
'91 Alfa Romeo 164L
'89 Volvo 244
Charles
Bookmarks