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post #1 of 12 (permalink) Old 12-25-2009, 11:01 AM Thread Starter
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Car Wouldn't Start

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Hi all,
my mother's 2006 Impala LT with 3.5L V6 engine suddenly wouldn't start last night.
No crank, though lights came on and onstar was working which I think means the alternator was OK.
Roadside assistance came by and jumped the battery and the car started. He assumed its the battery and the car is 4 years old with only 10,000 miles so that should be it.
I did notice something odd though. The clock on the stereo had stopped at 2PM (I tried to start it at 5PM). If the battery was so dead as to stop the clock on the stereo than wouldn't all the lights be completely dead as well, or is there a wiring issue?
Any info would be appreciated. She;s bringing it in tomorrow since its christmas and pep boys is closed (no dealers near her). I'm going to have her get a ProStart Battery.
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post #2 of 12 (permalink) Old 12-25-2009, 11:02 AM
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typical of a dead battery my dude. did the starter click?

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post #3 of 12 (permalink) Old 12-25-2009, 11:35 AM Thread Starter
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typical of a dead battery my dude. did the starter click?
I did hear it click, also a bunch of other odd sounds, which may have been related to the onstar?
I let the car run for 25 minutes.
Today the car started right away so maybe she won't need a jump tomorrow before bringing it over to Pep Boys.
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post #4 of 12 (permalink) Old 12-25-2009, 11:57 AM
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yeah that's your battery man. one thing to consider is the alternator could have died leading to the battery dying! take a multimeter to the battery terminal on the alternator. the big red or black wire. it should read from 13.4-14.8v. if it's under 13.4 you have a bad alternator or regulator.

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post #5 of 12 (permalink) Old 12-25-2009, 01:02 PM
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my voltage reads 15.5 during the day when I am driving, is that really bad?



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post #6 of 12 (permalink) Old 12-25-2009, 01:17 PM
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do you have an under drive pulley or smaller alternator pulley?

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post #7 of 12 (permalink) Old 12-25-2009, 01:19 PM
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yes I actually



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post #8 of 12 (permalink) Old 12-25-2009, 03:12 PM Thread Starter
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Quote:
Originally Posted by ff_drift_lol View Post
yeah that's your battery man. one thing to consider is the alternator could have died leading to the battery dying! take a multimeter to the battery terminal on the alternator. the big red or black wire. it should read from 13.4-14.8v. if it's under 13.4 you have a bad alternator or regulator.
The guy who jumped me had a multimeter on him and he said it wasn't the alternator so hopefully he got it right.
I also don't think onstar will work if the alternator is dead.
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post #9 of 12 (permalink) Old 12-25-2009, 06:42 PM
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the car could have been running on just the battery. the pcm runs on 5v it doesn't take much power to keep an engine running. and onstar wouldn't be much of a draw i am not totally sure though. the only thing that doesn't work for me with a low battery is my hid's they have a serious draw and last about a minute and my battery is pretty shot it's the original acdelco with 66k. the only way to really know is by checking the alternator's output voltage

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post #10 of 12 (permalink) Old 12-25-2009, 07:06 PM Thread Starter
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I'll have Pep boys check the alternator but I'm sure they do that automatically.
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