Hey, I went to have the battery and alternator checked today and the computer read that there were failed diodes. Is this something I can fix without replacing the alternator or no?

 

at 12 years old the best bet is to replace the alternator with a Reman. unit of good quality. There are other components inside the alternator that have worn also, and diodes are soldered to the parts inside the alternator./ Done incorrectly and you will be back at your original problem.

 

ok thank you