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Old 01-27-2007, 09:37 AM   #1
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Default voltage gauge and alternator problem

Hi,

About a week ago, when I started my 93 bonneville in the morning, the voltage meter pointed to 12, the check gages light stayed on and I heard "dong, dong" alter. After about 5 minutes driving, the voltage meter raised to the normal 14. the check gages light went off.

It has been like that every time the car is started in the cold. it starts fine if the car is still warm.

What could be the problem? Thanks.
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Old 01-27-2007, 05:19 PM   #2
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Sounds like the alternator is on it'* way out. You can go to Advance or Autozone and get a free battery/alternator test.
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Old 01-27-2007, 08:30 PM   #3
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I think the best action would be to disconnect the batter cables and pull the boots off. I bet you find corrosion and become about the 15th victim of the same problem this month on this Forum.
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Old 01-28-2007, 07:11 AM   #4
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Quote:
Originally Posted by BoneZ
Sounds like the alternator is on it'* way out. You can go to Advance or Autozone and get a free battery/alternator test.
Sounds more like a weak battery or bad electrical connections from what younghelio2 describes. Do what Bill says first, then we'll be able to make another assessment based on the results.
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Old 02-02-2007, 05:41 AM   #5
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while you are doing that, you might as well start the car and then disconnect the battery cables. If the car dies, your alternator is bad and then you can come to the bonneville gear section and sign up for the high ouput alternator group buy next thursday $185.00 plus shipping
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Old 02-02-2007, 08:01 AM   #6
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Quote:
Originally Posted by briancole23
while you are doing that, you might as well start the car and then disconnect the battery cables. If the car dies, your alternator is bad and then you can come to the bonneville gear section and sign up for the high ouput alternator group buy next thursday $185.00 plus shipping
Our electrical systems and PCM'* (aka computers) don't take kindly to removing cables while running.

And then there'* the possibility of shorting the system or himself.
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Old 02-02-2007, 04:53 PM   #7
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Quote:
Originally Posted by BillBoost37
Quote:
Originally Posted by briancole23
while you are doing that, you might as well start the car and then disconnect the battery cables. If the car dies, your alternator is bad and then you can come to the bonneville gear section and sign up for the high ouput alternator group buy next thursday $185.00 plus shipping
Our electrical systems and PCM'* (aka computers) don't take kindly to removing cables while running.

And then there'* the possibility of shorting the system or himself.
I am going to say this again... I seem to repeat myself a lot on this one... Do Not... Disconnect the battery cables on a Modern Computer controled car while its running.. Doing this is much the same as unplugging the internals of you home PC while it still up and running.. And in some cases a GM vehicle will stall if the battery is disconnected as the PCM supplies the power field to the alternator...

So Again... DO NOT disconnect the battery while the car is running...

If you want to do this to an Old School Chevy 350 V8 that has 0 electronics then be my guest...

Brian, please do not reccomend this unless you want to pay to repair a members car

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Old 02-02-2007, 05:21 PM   #8
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Absolutely agree! Another thing to remember is that the alternator puts out an alternating current, not direct current like the old generators. The diodes in the alternator then turns that ac current into pulsating direct current, which at peak will be much higher than when it is smoothed out by the battery. Electronic circuits despise alternating or pulsating direct current as a supply.
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Old 02-07-2007, 10:33 PM   #9
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Thanks for the advice and discussion. The battery is fine. Problem solved after changing alternator.
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Old 02-07-2007, 11:45 PM   #10
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Default Understanding Alternators -- an Overview

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