Remove the brush holder from the rear of the alternator (a few screws). See
if the brushes are worn down past their limit. You can buy a new brush
holder from the dealer (~$30), or solder on new ones yourself.
If new brushes doesn't fix the problem, you need the old alternator
OR even cheaper from an auto electric supply house. The last time I
bought brushes they were a buck a piece.
Failing that the regulator rectifier can go bad as well but this part is
harder to get and can cost almost as much as a cheap re-built alternator.
On Thu, 26 Apr 2007 01:09:55 +0000, Speedy Pete wrote:
Wow. On an old Celica I spent a whopping $38 to rebuild the alternator.
The brushes were ~$1 each, and the regulator was $36. An afternoon with a
screwdriver and a 10mm wrench and I once again had a good working
alternator that lasted the rest of the life of the car (275,000 miles)
Check the bearings, too. The bearings seized on an '85 Corolla I have. I
didn't replace them when I did the brushes as they were still in good
shape, and now I can't get the alternator off the car!
150-200K miles is about the life expectancy for brushes, and worn brushes
are the most common cause of alternator failure. I'd go in that direction
first. Be sure to disconnect the battery before removing the brush assembly!
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.