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Old 07-22-2007, 02:25 AM   #1
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battery light coming on....

ok i got a 99 v6 stang. well my battery kept dieing on me and everytime i would go to floor it and it would get to high rpms the battery light would go on and all my lights would dime. so i bought a new batter which is also stronger and it still does it...i dont have a system or anything...i also had the alternator checked and its fine.....think u guys would help me out.....o and the plugs and wires are the original ones...could that be the problem?? thanks
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Old 07-22-2007, 02:44 AM   #2
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Re: battery light coming on....

It sounds like to me a wiring issue. There is either a short or a drain. See what someone else may say, I could be wrong, and I might be. I'm still a novice with cars.
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Old 07-22-2007, 09:59 AM   #3
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Re: battery light coming on....

I would pick up a new battery, only because that one is more than likely toast, and some new cables and start there.

Another thing is, even though your alternator is putting out the correct voltage, it may not be putting out enough amperage to charge the battery.
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Old 07-22-2007, 10:08 PM   #4
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Re: battery light coming on....

i got a new battery already and it still does it.
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Old 07-23-2007, 08:25 AM   #5
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Re: battery light coming on....

It might be your alternator, some times you can over spin them (or if they are messed up overspin them vs you wouldnt be able to if they were working right) and this can cause some issues. Get the alternator tested and see if they can test it as you get up in the rpms.

try not to do it because the whole system loses power aka fuel pump.
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Old 07-23-2007, 08:59 AM   #6
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Re: battery light coming on....

Most places have a bench tester for alternators/starters anyway. Take it off (which isn't hard at all) and have someone test it inside. The correct voltage by the way is around 14.5 with 13.5 being lowest acceptable, and 15.5 being highest. Amperage is typically in the 90 range but can vary.
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Old 07-23-2007, 09:15 AM   #7
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Re: battery light coming on....

what do you have done to the car?

im thinkin maybe in conjunction to possibly decreasing performance in your alternator (not broken yet) and/or deteriorating wiring, something simple such as your A/C or possibly stereo system could bog the entire system down.
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Old 07-23-2007, 02:48 PM   #8
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Re: battery light coming on....

Check your cables. If they have any growth on them then it will hurt the connection. Make sure they are good and tight and not slipping around.
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Old 07-23-2007, 11:22 PM   #9
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Re: battery light coming on....

That was happening with my car a year ago. The batter light would come on at high rpm and it was making a whining sound. I went threw the whole deal with putting a battery in first and it still did it. Turns out it was the alternator. I got one from the bone yard off a t bird and its worked fine.
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Old 07-26-2007, 02:10 AM   #10
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Re: battery light coming on....

ok guys thanks a lot..i got the alternator checked but it was still on the car and they reved it up and all...i think im gonna check it agian but this time rev it up to where the light comes on....if its not my alternator do u think it could be my plugs and wires???? ive only had the car for 3 years and idk if the owner before me ever changed the plugs and wires??? but im gonna do the alternator first....i keep u guys posted on what happenes.....
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Old 07-29-2007, 01:05 AM   #11
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Re: battery light coming on....

the plug & wires have nothing to do with your problem. it's prob. the alt.
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Old 07-29-2007, 02:31 AM   #12
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Re: battery light coming on....

k im getting a new one so we will see if that solves the problem
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