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CaddyInfo.com Cadillac Discussion Forum > General Cadillac Help and Discussion > Cadillac Discussion Forum |
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 Nov 9 2009, 09:17 AM
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#1
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Reader (10+ posts)  Group: Registered Posts: 13 Joined: 12-August 07 Member No.: 6798 98 deville Northstar 4.6L V8 (LD8/L37)  |
Voltage on dash shows 12v the alternator is not charging battery, voltage at 12v at battery.
No battery lamp on dash no codes, is this a bad alternator? How do I remove it what has to come out, manual shows raditor, fans air bag disconnect Etc etc, any tricks. We all benefit from shared knowledge, and we would love to have you participate fully. Registration is free. As a Registered Reader you can Post, Reply, Search, and more! |
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Nov 9 2009, 09:24 AM
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#2
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 Cadillac Lover  Group: CaddyInfo.com Staff Posts: 15818 Joined: 19-November 05 From: Long Island, NY Member No.: 2998 96 Deville 119k Miles Northstar 4.6L V8 (LD8/L37) |
Try retrieving the DTC codes from your on board diagnostic computer. Go to the top of this page, click HOW TO, then DTC codes and then follow the directions for your year, if you have an alternator/charging problem a code may have been set
-------------------- I realize that I am in fact BIASED, but that is why I am an Enthusiast!
Increases of temperature are human-caused. Decreases are nature-caused |
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Nov 9 2009, 09:41 AM
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#3
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Reader (10+ posts) Group: Registered Posts: 13 Joined: 12-August 07 Member No.: 6798 98 deville Northstar 4.6L V8 (LD8/L37) |
Showing the following:
Ipc B 1522 Trc U 1255 History I cleared the other codes battery was disconnected causing history codes. |
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Nov 9 2009, 09:51 AM
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#4
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Cadillac Lover Group: CaddyInfo.com Staff Posts: 15818 Joined: 19-November 05 From: Long Island, NY Member No.: 2998 96 Deville 119k Miles Northstar 4.6L V8 (LD8/L37) |
It does not sound like you are having a problem. What does the digital gage show immediately after startup. 12v at the battery is good. 12v or so running after the engine is warmed up is not a problem, less than 12v is
What symptoms are you having? Clean the battery connections especially the positive connection at the battery with is a two wire sandwich, take off the red insulator Have your battery load tested -------------------- I realize that I am in fact BIASED, but that is why I am an Enthusiast!
Increases of temperature are human-caused. Decreases are nature-caused |
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Nov 9 2009, 10:20 AM
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#5
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Reader (10+ posts) Group: Registered Posts: 13 Joined: 12-August 07 Member No.: 6798 98 deville Northstar 4.6L V8 (LD8/L37) |
QUOTE (BodybyFisher @ Nov 9 2009, 10:51 AM)  It does not sound like you are having a problem. What does the digital gage show immediately after startup. 12v at the battery is good. 12v or so running after the engine is warmed up is not a problem, less than 12v is What symptoms are you having? Clean the battery connections especially the positive connection at the battery with is a two wire sandwich, take off the red insulator Have your battery load tested |
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Nov 9 2009, 10:47 AM
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#6
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Reader (10+ posts) Group: Registered Posts: 13 Joined: 12-August 07 Member No.: 6798 98 deville Northstar 4.6L V8 (LD8/L37) |
It does not sound like you are having a problem. What does the digital gage show immediately after startup. 12v at the battery is good. 12v or so running after the engine is warmed up is not a problem, less than 12v is
What symptoms are you having? Clean the battery connections especially the positive connection at the battery with is a two wire sandwich, take off the red insulator Have your battery load tested Car would not turn over, charged the battery and its started fine, I have removed the cables and covers and cleaned both terminals. Battery shows 11.4 with the feedback connector removed from alternator with alternator 2-pin removed it had a code of IPC B1910 current, so I am assuming it is seeing the alternator. At started up with connector replaced it read 11.2 and now says battery not charging. I will get the battery tested. |
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Nov 9 2009, 10:52 AM
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#7
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Cadillac Lover Group: CaddyInfo.com Staff Posts: 15818 Joined: 19-November 05 From: Long Island, NY Member No.: 2998 96 Deville 119k Miles Northstar 4.6L V8 (LD8/L37) |
I am surprised you are not getting any low voltage/charging codes or the L terminal code if you are having an alternator problem. Check for a dead cell in the battery to start and check codes, post even history codes
-------------------- I realize that I am in fact BIASED, but that is why I am an Enthusiast!
Increases of temperature are human-caused. Decreases are nature-caused |
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Nov 9 2009, 11:29 AM
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#8
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Reader (10+ posts) Group: Registered Posts: 13 Joined: 12-August 07 Member No.: 6798 98 deville Northstar 4.6L V8 (LD8/L37) |
Brought battery to discount auto shows low voltage but not shorted, I am having them fully charge it now takes 35 min.
They said they could test the alternator on the car, is this a waste of time I used a volt meter and showed no charging. The codes I listed where the only codes present, since battery is out I can check it when I get back. This seems odd that the only code I recived is when I pulled the 2-pin plug on the alternator, then at 11.4 the battery and not charging came on. Am I missing something could the control unit not be sending it a signal to charge is there a way to test for this. It looks like a big job to remove it and would like to make sure and even how to remove it seems like a nightmare. Manual says, remove raditor, fans, disable air bags on and on. Is there a better way to drop this alternator with out major surgery? |
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Nov 9 2009, 12:23 PM
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#9
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Reader (10+ posts) Group: Registered Posts: 13 Joined: 12-August 07 Member No.: 6798 98 deville Northstar 4.6L V8 (LD8/L37) |
Battery is good so I guess I need to remove the alternator!
Any hints on the beat way to do this? Thanks |
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Nov 9 2009, 01:09 PM
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#10
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Cadillac Lover Group: CaddyInfo.com Staff Posts: 15818 Joined: 19-November 05 From: Long Island, NY Member No.: 2998 96 Deville 119k Miles Northstar 4.6L V8 (LD8/L37) |
Do a search, its not easy, but it can be done, I removed mine. Take off the inspection cover off the bottom and wheel well to gain more room to work. Give you have a 98 maybe your brushes are worn, but I would have liked to see a DTC code
-------------------- I realize that I am in fact BIASED, but that is why I am an Enthusiast!
Increases of temperature are human-caused. Decreases are nature-caused |
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Nov 9 2009, 02:33 PM
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#11
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Enthusiast (250+ posts) Group: Registered Posts: 397 Joined: 22-September 04 Member No.: 1510 96 DeVille |
I'm not sure if the '98 is the same as my '96. I did mine over 2 years ago. I did not remove the radiator (I did have to remove a fan In addition to the access pannel - which was no big deal) the alternator needs to be rotated in such a way that it can be dropped down & out between the radiator, and the block. Only trick I can offer is to protect your radiator with some cardboard so as you are pulling the alternator down, you don't mess up the radiator. It's very tight clearance. - also make sure you get an ACDELCO, or have yours rebuilt with ACDELCO parts.
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Nov 9 2009, 02:46 PM
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#12
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Cadillac Lover Group: CaddyInfo.com Staff Posts: 15818 Joined: 19-November 05 From: Long Island, NY Member No.: 2998 96 Deville 119k Miles Northstar 4.6L V8 (LD8/L37) |
One more thing, put a piece of plywood in front of the radiator so you dont damage it with the alternator
-------------------- I realize that I am in fact BIASED, but that is why I am an Enthusiast!
Increases of temperature are human-caused. Decreases are nature-caused |
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Nov 10 2009, 12:10 PM
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#13
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Reader (10+ posts) Group: Registered Posts: 13 Joined: 12-August 07 Member No.: 6798 98 deville Northstar 4.6L V8 (LD8/L37) |
I got it replaced, did not have to remove the radiator, thanks everyone for the help.
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Nov 10 2009, 01:41 PM
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#14
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Cadillac Lover Group: CaddyInfo.com Staff Posts: 15818 Joined: 19-November 05 From: Long Island, NY Member No.: 2998 96 Deville 119k Miles Northstar 4.6L V8 (LD8/L37) |
QUOTE (Tampa cady @ Nov 10 2009, 01:10 PM) I got it replaced, did not have to remove the radiator, thanks everyone for the help. So the bottom line?, was it bad? -------------------- I realize that I am in fact BIASED, but that is why I am an Enthusiast!
Increases of temperature are human-caused. Decreases are nature-caused |
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Nov 10 2009, 07:33 PM
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#15
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Reader (10+ posts) Group: Registered Posts: 13 Joined: 12-August 07 Member No.: 6798 98 deville Northstar 4.6L V8 (LD8/L37) |
I have restored 4 Porsche 928's and it's not as bad. I work on my toys but my wifes caddy is a project, it is very high tech for the year.
I have a couple of other issues with the air and a shudder at steady cruze, but will start another thread. |
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