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Alternator not charging

Tiny
BARRY BLUNT
  • MEMBER
  • 1999 CADILLAC DEVILLE DTS
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 178,000 MILES
I had the alternator rebuilt. I am not getting any power from the alternator before and after the alternator was rebuilt, because it was burnt in the middle. Detroit rebuild everything and it should work, but I am not getting any power.
Saturday, June 25th, 2016 AT 7:46 PM

15 Replies

Tiny
BARRY BLUNT
  • MEMBER
  • 5 POSTS
The alternator is not putting out any power at all I had some recheck it and they said there is a short somewhere. I am not sure where it could be, but when he checked it I had no problems with the alternator.
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Saturday, June 25th, 2016 AT 7:53 PM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
Maybe it is a blown fuse or fried fusible link not allowing your "good" alternator's juice to reach the battery.

If you are still kind of lost on this, send your VIN number and I will attempt to find an informative wiring diagram in "Prodemand". It should list all components in the charging system with their locations.

The Medic
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Saturday, June 25th, 2016 AT 8:25 PM
Tiny
BLUNTBARRY966
  • MEMBER
  • 4 POSTS
My battery was draining because I have A breathalyzer in the car that drains my battery and I put the charger on it so I do not have to start all time and I think that is why I burnt out the alternator, but my air conditioner stopped working and cooling fans, but when I have somebody check the car he said there was a short in there. My alternator was working no problem and when I started the car up the alternator wont work. I put the charger on it get a full charge and it will start working again the alternator then it just want start working at all the alternator I took the alternator out and had it rebuilt and it did not make a difference. There is no voltage at all coming from the alt stripped away is in the new fuse between the battery and the alternator on the hot. I checked the fuses and I cannot find any burnt fuses.
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Saturday, June 25th, 2016 AT 9:34 PM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
Maybe you can send a picture of a diagram of how this device is tied into you ignition/ electrical system, maybe we can figure out why it is bogging the system down.

The Medic
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Sunday, June 26th, 2016 AT 9:23 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
Hey guys,

I found this for you, I hope this helps.

Best, Ken Lavacot
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Sunday, June 26th, 2016 AT 9:31 AM
Tiny
BLUNTBARRY966
  • MEMBER
  • 4 POSTS
Gave up on it it is Sunday, Monday is tomorrow I am going to probably see if I can get it brought in and have it analyzed. I will let you know what happens. Thanks for you time. I will get back to you.
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Sunday, June 26th, 2016 AT 2:45 PM
Tiny
BLUNTBARRY966
  • MEMBER
  • 4 POSTS
I was going to ask you one thing though that PCM from the junkyard can they program it to my car. It came out of the same year and model.
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Sunday, June 26th, 2016 AT 2:51 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
Sometimes that works, but it is tough to say for sure. Did you check for power at the main feed wire at the alternator?
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Sunday, June 26th, 2016 AT 6:55 PM
Tiny
BLUNTBARRY966
  • MEMBER
  • 4 POSTS
What about the wires that go to the starter are any of those wires going to the starter? If not to charge if they are grounded.
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Sunday, June 26th, 2016 AT 7:26 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
Yes, none of the wires going to the starter can be grounded.
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Monday, June 27th, 2016 AT 8:06 AM
Tiny
BARRY BLUNT
  • MEMBER
  • 5 POSTS
Put a new battery in still not working
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Monday, June 27th, 2016 AT 10:53 AM
Tiny
BARRY BLUNT
  • MEMBER
  • 5 POSTS
Yeah I don't know what's going on it just ain't charging yet
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Monday, June 27th, 2016 AT 10:57 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
I would run new wires to the battery and controllers. The wiring is pretty simple follow the diagram I sent you.
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Monday, June 27th, 2016 AT 12:11 PM
Tiny
BARRY BLUNT
  • MEMBER
  • 5 POSTS
I called the guy that rebuild the alternator he told me to turn the key on check the two wires out of the light that goes in the alternator and see if there any of them are hot in there was no hot on either one of them wires so I kind of thought it's got to be the PCM or something towards the ignition area but it took that computer up so I'm thinking that's what it is a PCM so I'm going to get a new one and let you know how it comes out
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Monday, June 27th, 2016 AT 5:15 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
Okay Sounds good
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Monday, June 27th, 2016 AT 6:55 PM

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