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Author
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Topic: Battery light is on on my 02 GT
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harry
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Member # 8192
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The battery light is on on my 02 GT changed the battery and the alternator but light is still on. Does anyone know why?
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harry
Posts: 88 | From: sacramento | Registered: Feb 2008
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Adam5.0
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Member # 6995
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Nothing wrong with the old battery. It's the alternator.
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want something old and japanese
Posts: 1609 | From: Brentwood | Registered: Aug 2006
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dohc90lx
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Member # 11863
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fuse or inline fuseabe link. cant remember the charging system stlye but look at a skematic
Posts: 129 | From: antioch | Registered: Apr 2012
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Venomousnotch
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Member # 8695
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I would say it's the alternator... ![[patriot]](graemlins/patriot.gif)
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🏁•2004 MUSTANG SVT COBRA•🏁
"WHEN THE WHINING STARTS,IT MEANS JUSTICE IS ABOUT TO BE SERVED"..
Posts: 7610 | From: *NORTHERN*KILLA4NIA* | Registered: Oct 2008
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harry
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Member # 8192
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I already changed the alternator. Could it have to do with the starter that needs to be changed next.
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harry
Posts: 88 | From: sacramento | Registered: Feb 2008
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dohc90lx
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Member # 11863
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no. there needs to be power on the sensing circut leading to the alternator. if there is no power there the alternator wont go into field. also there is a fuse for the battery warning lamp. if its blown the lamp will remain iluminated. starter has nothing to do with that.
Posts: 129 | From: antioch | Registered: Apr 2012
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harry
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Member # 8192
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Ok thanks for the info guys.
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harry
Posts: 88 | From: sacramento | Registered: Feb 2008
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harry
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Member # 8192
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Well I checked the fuses there all good now the battery light is on and the battery gauge is all the way down car dies after being started for a min.
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harry
Posts: 88 | From: sacramento | Registered: Feb 2008
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LXjames
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Member # 10791
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Loose connections? Bad wires? Faulty alternator?
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On Point Motorsport prez.
King Lx
Posts: 4761 | From: Pittsburg CA | Registered: Mar 2011
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harry
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Member # 8192
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Gonna take the alternator and the battery in to get checked.
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harry
Posts: 88 | From: sacramento | Registered: Feb 2008
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90 7up lx
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Member # 10304
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My friend has replaced 3 alternators since he has had his new edge gt in the past 5yrs, I Wana say check the alt
Posts: 1266 | From: north valley | Registered: Sep 2010
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302n/a
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Member # 1465
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i had this problem it's an issue with the 02-04 gt i had a check engine light and battery light it was throwing a cam sensor code al lthis was due to a faulty alternator.Theres a possibility u may have gotten a bad alternator replace it again.Spend the extra money and get a pa performance 130 amp lifetime warranty.
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Raiders A's Warriors Sharks
Posts: 2605 | Registered: Jun 2002
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dohc90lx
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Member # 11863
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quote:
Originally posted by 302n/a:
i had this problem it's an issue with the 02-04 gt i had a check engine light and battery light it was throwing a cam sensor code al lthis was due to a faulty alternator.Theres a possibility u may have gotten a bad alternator replace it again.Spend the extra money and get a pa performance 130 amp lifetime warranty.
rfi on this problem. ac compressors can cause similar symptoms. (unrelated to his problem but little known fact)
Posts: 129 | From: antioch | Registered: Apr 2012
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dohc90lx
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Member # 11863
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check for resistance between the posative battery post and the large hot lead on the alternator. there should be little to no resistance there, other than that have the alternator checked if its good check the power for the genMON circut. pm me if you get lost and i can look it up for u real quick while im at work. also fyi those stupid aftermakret alternators tend to overcharge batteries. seems like every time i see a swolen battery there is a kragen or autozone alternator sitting right on top of the motor.
Posts: 129 | From: antioch | Registered: Apr 2012
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harry
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Member # 8192
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Just swapped the alternator and battery again the battery light is still flashing once in a while seems like when I accelerate it comes on but no engine light. Was told it could be a bad ground maybe starter ground is this possible?
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harry
Posts: 88 | From: sacramento | Registered: Feb 2008
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harry
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Member # 8192
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Where is the genmon circuit located?
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harry
Posts: 88 | From: sacramento | Registered: Feb 2008
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coupedup
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Member # 9987
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Lol,... Have you checked all your battery ground wire to make sure its grounded efficiently ?
[ August 29, 2012, 06:59 PM: Message edited by: Nifty50 ]
Posts: 4406 | From: Ca | Registered: May 2010
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harry
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Member # 8192
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Seems like the only time the battery light comes on now is when I accelerate.
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harry
Posts: 88 | From: sacramento | Registered: Feb 2008
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dohc90lx
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Member # 11863
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ok. in the central junction box (the fuse box inside the car under the dash).. fuse 5 is a 15 amp fuse. its prob good but this is the fuse that powers your battery lamp.. in the battery junction box ( fuse box in the engine compartment ) fuse 1 is 20 amp. this is your genmon line. make sure that fuse is good. then off the large black with orange wire off the alternator there are two grey fuseable links. make sure they are both good. with the key on and engine off you should see power on the yellow with white. its a very simple non monotored charging system. you need a ohm meter though to test the fuseable links. i have a feeling this could be your problem
Posts: 129 | From: antioch | Registered: Apr 2012
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harry
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Member # 8192
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So I found the problem the ground for the wire harness of the starter, alternator, and battery was loose tightened it down and it's all good now thank god. Thank you to everyone that helped I appreciate it.
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harry
Posts: 88 | From: sacramento | Registered: Feb 2008
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