Question about 1999 GMC Sierra

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The battery icon is on on my dashboard , my amp gage reads 12-13 amps .I replaced my battery yesterday, do you think my alternater is bad, I've already replaced tthat 3 years ago . I drive a 1999 Gmc 1500 w/ a 5.7 vortec

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  • harringtonj4 Jan 04, 2009

    Thankyou for your help, I brought it to Auto Zone and it was a bad alternater. I replaced it right there in the parking lot. Thanks again

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If alternator is good approximately how many amps should it be putting out

Posted on Dec 13, 2013

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Can you start the truck and do you have a digital volt meter?

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The battery indication on the dash will come on if the alternator is not charging correctly. If it is still driveable, you could take it to the nearest Autozone and they can roll out a testing cart to your vehicle that they can hook up and it will test the battery, alternator and so on. Its very good at saving a lot of time and guess work.

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You can take your Alternator to Auto Zone, Oriellys, Pep Boys and get it Checked to Be sure before we go any Further. Let me Know!

Posted on Jan 04, 2009

  • Travis Humphries
    Travis Humphries Jan 04, 2009

    No Problem! Happy to Help!

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Haywire gauges


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Im seeing a battery icon warning light in the dashboard.


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1 Answer

Not charging


First tell me why you don't think it's charging.
Because of the voltage reading you are getting at the battery terminals? The range you want is between 13.6v to 14.2v. The higher the voltage the lower the amps. and true the other way, the lower the voltage the higher the amps. If you get a reading of 13.6v or lower, the alt is nearing or at max output. An alt can only run at maximum for around fifteen minutes and it will start slinging solder from overheating. It's a good indication the battery is either totally dead or junk. Charging above 14.2 the alternater is running wide open and is only putting out high volts which will cause the battery to boil , in turn destroying it. This is a bad alternater. All alternaters have integrated voltage regulater with the exception of ver few of the earlier ones. You cannot test an alternater by removing a battery cable to see if the engine keeps running without taking great risk of damaging the alt, regulator. So tell me why you feel it isn't charging. Remember an alt is not made to charge dead batteries. Their sole function is to maintain the battery charge. Without a battery, the alt won't last 10 seconds.
Hope to hear from you and good luck.

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1 Answer

The altenator has no power


Are all the cables clean & connected firmly? If so boast the vehicle & while running & booster disconnected put an amp. meter on the neg & pos of battery. If amp. meter reads over 13.2 or higher alternater O.K. if lower Change alternater.

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check the battery terminals they might need to be renewed or just not tight enough.

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u may have parasitic load what that is when like somethin on the car stays on even if u shut everything off causing to drain the battery

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