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Author
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Topic: Battery light on
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1sickGT
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Member # 9276
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posted
 
 
My battery light came on 2 days ago. The car drives good and starts up rite away. My voltage was 11.9 at idle. I disconected the battery while the car was on and it keep idleing good. Ther is a wierd noise and smell coming from the altnator. Could the altenator be bad?
Help please!!
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**R.I.P Willie Guzman 5LTRSVT**
2015 Mustang GT
2015 Harley Davidson iron 883
Posts: 1815 | From: San Jose | Registered: Jul 2009
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93coupessp
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Member # 8418
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posted
Should have more than 11.9 at idle. First check the 20 amp fuse for the alt then if that's not it go ahead and remove your alt and take it to be tested. If it's a bad alt I would look into using this time to get a newer 3g alt swap. The old style 5.0 Alts are notorious for causing too much current for the oem connector and melting the wires coming off the alt and causing serious electrical fires. Tho I've never had it or seen it happen the 3g is a better upgrade for amplifires upgraded ignition systems fuel pumps
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89 gt project
09 f250 diesel 605hp
14 cts-v
13 harley fxdb 103ci
Posts: 1919 | From: Hell | Registered: May 2008
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nasty93
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Member # 8935
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posted
battery light means your alt. goin out.check all plugs and cables related to the charging system.
Posts: 464 | From: windsor ,ca | Registered: Feb 2009
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stangin'
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Member # 514
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posted
alt. is going out or it's dead already. at idle it should be close to 14V. when the alt. is not charging the battery, it's around 12V. loosen the belt and see if you can spin the alt. pulley easily. if it spins with little to no friction then it's toast.
[ December 16, 2010, 01:06 AM: Message edited by: stangin' ]
Posts: 2993 | From: Bay Area | Registered: Oct 2001
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1sickGT
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Member # 9276
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posted
Sorry guys its a 2002 gt . I'm gona take it of tomorrow and see what happens..
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**R.I.P Willie Guzman 5LTRSVT**
2015 Mustang GT
2015 Harley Davidson iron 883
Posts: 1815 | From: San Jose | Registered: Jul 2009
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93coupessp
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Member # 8418
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posted
even if its a 2002 gt everything i said still pertains to you except the 3g swap. its def your alt have it tested to be sure
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89 gt project
09 f250 diesel 605hp
14 cts-v
13 harley fxdb 103ci
Posts: 1919 | From: Hell | Registered: May 2008
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1sickGT
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Member # 9276
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posted
Yea tomorrow im gona take the belt and do what stagin mention. Thanks man appreciate it.. ![[patriot]](graemlins/patriot.gif)
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**R.I.P Willie Guzman 5LTRSVT**
2015 Mustang GT
2015 Harley Davidson iron 883
Posts: 1815 | From: San Jose | Registered: Jul 2009
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1sickGT
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Member # 9276
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posted
Thanks guys I think I fix the problem
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**R.I.P Willie Guzman 5LTRSVT**
2015 Mustang GT
2015 Harley Davidson iron 883
Posts: 1815 | From: San Jose | Registered: Jul 2009
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90FoX
FoX
Member # 1974
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posted
Wow are you serious? From what I know you are never suppose to disconnect the battery while the car is running. you could fuck some serious shit up.
If you didn't you got lucky this time. ![[Eek!]](eek.gif)
who are where did you get this idea from? ![[Confused]](confused.gif)
Posts: 5364 | From: Shooting Skeet | Registered: Oct 2002
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Mustang Guru
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Member # 4119
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quote:
Originally posted by 90FoX:
Wow are you serious? From what I know you are never suppose to disconnect the battery while the car is running. you could fuck some serious shit up.
If you didn't you got lucky this time.
who are where did you get this idea from?
Never had anyone telll me that....I've disconected the battery before on various cars due to battery lights on friends car and just the other day on my mother n laws van since I don't have a volt meter n that's just my way of checking to see if the alternator good or not
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1990 x-chp highway lil 302
1977 caprice classic 2dr.{Sold} 1988 coupe 4cyl dd{sold}
Posts: 1171 | From: Uptown Bound | Registered: Feb 2004
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90GT510
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Member # 9199
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posted
quote:
Originally posted by 90FoX:
Wow are you serious? From what I know you are never suppose to disconnect the battery while the car is running. you could fuck some serious shit up.
If you didn't you got lucky this time.
who are where did you get this idea from?
That's a quick way to test your alternator. If you disconnect the battery and the car dies you need a new alternator. If you still havin charging issues even if the car is running wit out the battery it means your battery might be bad.
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Stay Sydewayz
Posts: 1725 | From: East Bay/Dallas, TX | Registered: May 2009
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Mustang Guru
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Member # 4119
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posted
quote:
Originally posted by 90GT510:
quote:
Originally posted by 90FoX:
Wow are you serious? From what I know you are never suppose to disconnect the battery while the car is running. you could fuck some serious shit up.
If you didn't you got lucky this time.
who are where did you get this idea from?
That's a quick way to test your alternator. If you disconnect the battery and the car dies you need a new alternator. If you still havin charging issues even if the car is running wit out the battery it means your battery might be bad.
+1
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1990 x-chp highway lil 302
1977 caprice classic 2dr.{Sold} 1988 coupe 4cyl dd{sold}
Posts: 1171 | From: Uptown Bound | Registered: Feb 2004
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Blind
2.3L
CAFords OG
Member # 3052
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posted
that's fine on an old carb'd car with no computers.
on a modern car that has a computer controlling the engine, the transmission, the climate control, etc etc disconnecting the battery can spike the system, hooking it back up causing a load spike, etc, the dangers of causing MORE damage to the car FAR outway the convenience of not having to use a $2 dvm to check the voltage on the battery as compared to the voltage on the post on the back of the alternator.
shit, take the battery and alternator to an auto parts store and they'll test them for FREE if you can't afford a $2 dvm.
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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90FoX
FoX
Member # 1974
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posted
quote:
Originally posted by Blind:
that's fine on an old carb'd car with no computers.
on a modern car that has a computer controlling the engine, the transmission, the climate control, etc etc disconnecting the battery can spike the system, hooking it back up causing a load spike, etc, the dangers of causing MORE damage to the car FAR outway the convenience of not having to use a $2 dvm to check the voltage on the battery as compared to the voltage on the post on the back of the alternator.
shit, take the battery and alternator to an auto parts store and they'll test them for FREE if you can't afford a $2 dvm.
+1 exactly.
Posts: 5364 | From: Shooting Skeet | Registered: Oct 2002
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norcal351w
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Member # 9170
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disconnecting the battery is fine. Its not like you take it off and go inside and have lunch or something. you pop it off, if it dies or doesn't die, you know where to start. Then put it back in there when your done. I've done it to a ton of cars and RARELY were they not fuel injected
Posts: 44 | From: martinez | Registered: May 2009
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Blind
2.3L
CAFords OG
Member # 3052
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posted
quote:
Originally posted by norcal351w:
disconnecting the battery is fine. Its not like you take it off and go inside and have lunch or something. you pop it off, if it dies or doesn't die, you know where to start. Then put it back in there when your done. I've done it to a ton of cars and RARELY were they not fuel injected
and having sex without a condom wont always end up with a screaming brat 9 months later.
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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moeofit32
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Member # 10393
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posted
I love this site lol
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95 stroked and blown cobra
Posts: 2387 | From: antioch ca | Registered: Oct 2010
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1sickGT
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Member # 9276
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posted
quote:
Originally posted by Sic Wit it 50:
quote:
Originally posted by 90FoX:
Wow are you serious? From what I know you are never suppose to disconnect the battery while the car is running. you could fuck some serious shit up.
If you didn't you got lucky this time.
who are where did you get this idea from?
Never had anyone telll me that....I've disconected the battery before on various cars due to battery lights on friends car and just the other day on my mother n laws van since I don't have a volt meter n that's just my way of checking to see if the alternator good or not
+1 I never had anyone tel that. It was just a 10 second thing.
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**R.I.P Willie Guzman 5LTRSVT**
2015 Mustang GT
2015 Harley Davidson iron 883
Posts: 1815 | From: San Jose | Registered: Jul 2009
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SPECIALTY15***MM PERFORMANCE***
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Member # 2978
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posted
back in the day when there were external regulated alternator pulling th pos cable off to check was the easiest way to check it on late model cars when you pull the pos cable off to check it will heat and burn the diodes in the alternator. should always just take it somewhere where they can do a proper load test. theres nothing worse than chasing a charging problem when you cause another with out even knowing.
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MM PERFORMANCE
916-993-9581
Posts: 861 | From: sacramento | Registered: Jun 2003
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