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08-22-2015
2006 grand prix base.
I just replaced my alternator because of how overcharged it was. In idle it was nearly 15.4 battery volts. So i replaced it and now all of a sudden when i start the car, it slowly starts up. I don't get it. Both the battery and belt is a year old.
Tune up?
08-22-2015
Are you aware that 04+ charging systems will vary between 15.5V-12.5V? If your system is not charging properly it could be due to the PCM or wiring may be to blame. If you put in a new alternator then it sounds like the problem is elsewhere.
Jeff
08-22-2015
If you unplugged the battery to replace the alt, as you should have, the ecu needs to relearn so things will be a little different for awhile.
08-22-2015
What is the voltage at start up? If 15.4v is after a few minutes or with no load, that is a bit high. Sounds like you may have killed the battery.
08-23-2015
It can actually be normal on an 04+
08-23-2015
If my car shows 15.2 volts it will throw a charge system failure message. The GXP's on the other hand do run with a little higher voltage from what has been pointed out on this very forum.
While driving if I monitor my voltage it usually runs 14.9 at the highest.
08-24-2015
My 01 ranges from 15ish all the way down to 13 flat depending on the day. Usually in the summer it hits 14 for a couple minutes and then settles down to 13 flat after half an hour of runtime or so. In the winter on really cold days it hits 15+ and rarely drops below 14.
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