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Old 06-12-2016, 11:53 PM   #1
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Check charging system light

I've got an odd one that I can't solve. I am getting an intermittent battery light with the Check charging system warning. I have pulled the alternator off and had it checked, verified that the battery is grounded properly and has a full charge, the battery is a year old.

Any suggestions on this would be much appreciated!
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Old 06-13-2016, 08:37 AM   #2
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I forgot to mention that the light seems to come on more when coasting or deceleration not when accelerating.

Thanks
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Old 06-13-2016, 10:06 AM   #3
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check battery/alternator connections (assume you already did) do you have stuff like lights/radio upgrades? It may be idle rpm is too low to keep up with extra load if you have it.
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Old 06-13-2016, 10:21 AM   #4
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Thanks for the reply. Yes all the connections have been checked/tighten, even doubled checked when I pulled the alternator off and had it checked at the parts house. Everything is stock on the car except an aftermarket radio I put in a few years back.
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Old 06-13-2016, 10:58 AM   #5
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check voltage car off = 12.6

running 13.8-14.2

see if it increases with rpm. Also what is your idle rpm? is it low
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Old 06-13-2016, 01:28 PM   #6
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You know, this very thing is heppening to me now.
My alternator was kaput, would short and kill the battery if you let it sit for a few days. Towards the end it was charging erraticaly (volt meter bounced all over) but no battery/charging light. I put a tester on it and sure enough the alt was bad. So I replaced it and now it's charging perfect but the charge/batt light comes on....
WTF is this a delayed reaction or what? Electrical is NOT my specialty so hopefully some of you really smart guys will know WTF is going on here.
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Old 06-13-2016, 02:55 PM   #7
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The same thing happened in my 06 Mustang GT a few months back...it turned out to be my alternator.
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Old 06-13-2016, 06:47 PM   #8
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Quote:
Originally Posted by PendletonCowboy View Post
I've got an odd one that I can't solve. I am getting an intermittent battery light with the Check charging system warning. I have pulled the alternator off and had it checked, verified that the battery is grounded properly and has a full charge, the battery is a year old.

Any suggestions on this would be much appreciated!
Get a second opinion on the condition of your charging system by a completely different source. If you went to an auto parts store, it is entirely possible that there test equipment could be faulty. And just because your battery is charged, doesn't mean that it doesn't have a bad cell, or some other malady, causing the light to turn on.
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Old 06-13-2016, 06:59 PM   #9
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You know, this very thing is heppening to me now.
My alternator was kaput, would short and kill the battery if you let it sit for a few days. Towards the end it was charging erraticaly (volt meter bounced all over) but no battery/charging light. I put a tester on it and sure enough the alt was bad. So I replaced it and now it's charging perfect but the charge/batt light comes on....
WTF is this a delayed reaction or what? Electrical is NOT my specialty so hopefully some of you really smart guys will know WTF is going on here.
Same thing with your car Sal... Unfortunately, purchasing a rebuilt alternator is not a guarantee that your problem will be solved. I've had defective ones right out of the box.
It has been my experience that, in many cases, when the alternator fails, the battery fails right along with it. Especially if it was getting drained all of the way down to zero. A standard automotive battery will not charge back up completely, like a deep cycle marine/RV battery will.
Get the alternaor/battery tested.
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Old 06-13-2016, 07:06 PM   #10
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Same thing with your car Sal... Unfortunately, purchasing a rebuilt alternator is not a guarantee that your problem will be solved. I've had defective ones right out of the box.
It has been my experience that, in many cases, when the alternator fails, the battery fails right along with it. Especially if it was getting drained all of the way down to zero. A standard automotive battery will not charge back up completely, like a deep cycle marine/RV battery will.
Get the alternaor/battery tested.
I have a tester and they both check out okay, which is why I'm confused.
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Old 06-13-2016, 07:12 PM   #11
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I have a tester and they both check out okay, which is why I'm confused.
Does your tester put a load on the battery during the test procedure? And are you sure that it is working properly?
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Old 06-13-2016, 07:53 PM   #12
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Does your tester put a load on the battery during the test procedure? And are you sure that it is working properly?
At my age I'm not sure of anything.
Its a tester that checks when the engine is running. Always worked before-plus I've been driving the car for a few days and all seems normal.
So far.....
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Old 06-13-2016, 10:02 PM   #13
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I haven't had the battery tested under load but that was the next step.
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Old 06-14-2016, 05:03 PM   #14
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I called the company I bought my Alternator from. They are sending me another one.
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Old 06-16-2016, 04:22 AM   #15
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I had this same issue. Thought it was mainly a alternator issue since these alternators are "eh" realized that the fused wire that feeds the batter from the alternator was actually coming in contact with the engine as a ground. Patched it up and re installed it and was perfect again. Thought I was going to have to replace a PCM.
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Old 06-16-2016, 05:26 AM   #16
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^^^that was a good find
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Old 06-20-2016, 12:42 PM   #17
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I had the battery tested and it was was. Swapped out the alternator and that seems to have resolved the issue.
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Old 06-21-2016, 09:09 PM   #18
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When that happened to my 06 Mustang GT, it turned out to be my alternator, which was replaced a year prior to going bad. The auto parts store told me it was the battery. Took it to FORD and they found it to be the slternator.

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Old 06-21-2016, 09:20 PM   #19
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Installed my replacement alternator and boom. Fixed.
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Old 06-21-2016, 09:50 PM   #20
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Glad to hear that fixed the issue! Enjoy your ride.

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