2007 Impala Alternator repair help needed


Old 05-06-17, 07:13 AM
okrobie's Avatar
Thread Starter
Join Date: Dec 2014
Location: USA
Posts: 81
2007 Impala Alternator repair help needed

I have a good friend who has a dead alternator and no money. If it is feasible. I would like to replace the diodes. Would that have a good likelihood of fixing it? How much work is it. Can a semi skilled like me fix it?
Thanks, Jim
Sponsored Links
Old 05-06-17, 07:21 AM
pugsl's Avatar
Forum Topic Moderator
Join Date: Mar 2008
Location: Raleigh, NC
Posts: 7,863
here is video that should help
Old 05-06-17, 12:59 PM
Join Date: Jun 2010
Location: Canada (near The Motor City)
Posts: 611
How do you know the alternator is dead?
Old 05-07-17, 06:46 AM
Join Date: Oct 2008
Posts: 1,312
Learn to use a multimeter and test things before replacing them. This will save you a lot of time and money.
Old 05-10-17, 02:11 PM
Join Date: Dec 2016
Location: Canada
Posts: 182

The diode is in the assembly called a rectifier. These rarely fail on their own, more often they fail because the increasing resistance in the windings, so just replacing the diodes/rectifier might be a short live solution. But they do fail. You can do a simple multi meter test to see if the diodes have failed, lots of you tube videos on this.

Your Impala has a Bosch or Denso unit depending upon which engine it has, and parts are plentiful.

This place has a nice kit and they would probably consult with you up front as they don't want an unsuccessful rebuild.


If you want just the diodes I suspect they would supply as well, but most people just swap out for a new rectifier.

But I get you want to do this on the cheap, so sure it can be done with a bit of research if this sort of thing is interesting to you. I love to fix things, rather than just swap parts, just for the challenge!
Old 05-10-17, 05:30 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 45,583
I've worked on a lot of GM alternators and the biggest problem I've came across was the internal voltage regulator was defective.

If one or several diodes shorted..... you'd be getting low DC or excessive AC from the alternator.

With very high mileage you could have defective/worn brushes.

Without some basic testing... you're guessing at the problem.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes