One last thing, if you decide to replace your starter and/or alternator, consider getting them rebuilt If you take them into a “Auto Electric†shop they can inspect and provide you with a quote to rebuild and a detailed explaination as to source of your problem at no extra charge. A lot of people buy exchange alternators and starters. Some failures are attributed to inexpensive parts like brushes for example. Retailers love selling rebuilt alt&starters and giving you a core credit. They make a killing doing this. Save your money and your original equipment, rebuild not rebuy.