Battery light comes on under hard acceleration - Mustang Evolution

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Old 02-01-2005, 11:46 PM   #1
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Battery light comes on under hard acceleration

If I am at a red light and I floor it it jerks forward and the battery light comes on for about a second then goes off..... and my top end hp sucks bad......

What do you guys think? Bad belt, warped pulley... alternator going bad? Anyone seen this happen before?
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Old 02-02-2005, 12:16 AM   #2
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first, check your battery cables, as much of them as you can find, a bad ground could cause issues, if they look good, have your battery tested at advance

you could put your volt meter on your battery all day, and read 12 volts, but a load test is what really tests the battery

if the battery checks out, have the alternator tested (has to be removed to do so), and if thats not the issue, then i dont know what is
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Old 02-02-2005, 12:18 AM   #3
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Um....don't floor the poor thing...lol.
BTW, check out the sig quote...
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Old 02-02-2005, 08:36 AM   #4
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I would put a fresh belt on it, do you have an UD pulley?
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Old 02-02-2005, 10:04 AM   #5
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Yea, it's probally the belt slipping.
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Old 02-02-2005, 01:41 PM   #6
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Quote:
Originally Posted by justin00stang
I would put a fresh belt on it, do you have an UD pulley?
No UD pulley.

How much are belts?
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Old 02-02-2005, 02:33 PM   #7
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Its usaully between $15-$30 if you go to a place like Auto zone.
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Old 02-02-2005, 02:38 PM   #8
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Its usaully between $15-$30 if you go to a place like Auto zone.
Thanks I will try that and see if it helps. Could a alternator going bad cause this or no? When I am backing out of my driverway sometimes and put it from reverse to drive it stalls out... doesnt do it everytime though.... the rpms do drop very low as if its about to die though most of the time.

I have a extra alternator I can put on from a low mileage engine if the belt isnt the problem

btw can you take a look at this video I made and give me your .02 worth of what you think it is http://mustangevolution.com/forum/sh...ad.php?t=10362
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Old 02-02-2005, 03:00 PM   #9
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no idea brent, but
LMFAO AT BRAD'S SIG!!!!!!! bahahahahhahahaha.
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Old 02-02-2005, 09:31 PM   #10
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Well try the belt first. That takes the whole five minutes to install, and if it's not that, order one of those polished alternator casings from Rob ( :thumbs2: ) and take it to some old timer and let him rebuild it. It's not about volts on an alternator, it's about amps.
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Old 02-02-2005, 09:40 PM   #11
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I have a extra alternator I can use.
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Old 02-02-2005, 10:20 PM   #12
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yeah like that Brent?
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Old 02-02-2005, 10:27 PM   #13
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^ That is the exact same thing mine does
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Old 02-03-2005, 12:05 AM   #14
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alternators are pretty easy to change
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Old 02-03-2005, 12:06 AM   #15
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fvck what did i just put my self into....
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Old 02-03-2005, 12:09 AM   #16
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^ lmao
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Old 02-03-2005, 12:34 AM   #17
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correct me if I'm wrong, but if you were to put a voltmeter to a battery, it should read closer to 13 volts, right?
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Old 02-04-2005, 10:46 PM   #18
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^ no clue but I am replacing the alternator as we speak so I'll see if that fixes it.
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Old 02-05-2005, 12:18 AM   #19
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correct me if I'm wrong, but if you were to put a voltmeter to a battery, it should read closer to 13 volts, right?
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Old 02-05-2005, 01:12 AM   #20
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Alternators changed... to drunk to drive it so it will have o wait tioll tomoroow to test eit oit
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Old 02-05-2005, 01:30 AM   #21
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Old 02-05-2005, 10:15 AM   #22
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Alternators changed... to drunk to drive it so it will have o wait tioll tomoroow to test eit oit
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Old 02-05-2005, 12:53 PM   #23
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Well it looks like it fixed it... but we will have to see after more driving around
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Old 02-05-2005, 04:18 PM   #24
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Well the damn ground screw on the alternator I put on borke and I cant ground the thing. So now i got to put the old alternator back on tonight
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