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Go Back   Ford Powerstroke Diesel Forum > Ford 03-07 6.0L Powerstroke Forums > 6.0L Electronics Discussion
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6.0L Electronics Discussion TV's, Radios, everything electric and NON-Performance.

 
       

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Old 10-22-2009, 11:58 AM
Good Enough Good Enough is offline
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Battery Light

So a while back i gave my buddy a jump. His 2002 7.3 was deader than dead. Soon after that day I noticed my truck was getting harder and harder to start. Eventually my battery ligth came on. My Batts were dead. I took my batts and alt to get checked. The alt was only putting out like 9.3 volts but ths batts were good. so they charged them for me. I replaced the alt but the batt light was still on. Up untill today the batt light has been on intermitantly. If i leave the truck for more than 3-4 days it wont start. Finally this morn i went out to start it and it wouldnt start (i had just driven it the day before). i replaced both batteries today and it starts fine but the batt light is still on. I have no clue where to begin...

Cliff notes:

2 month old alt and 2 new batteries.... battery light still on.


thanks in advance guys...
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Old 11-24-2009, 02:28 PM
Good Enough Good Enough is offline
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Any help out there?
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Old Yesterday, 11:34 AM
urname7698 urname7698 is offline
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Double check the output of the alternator, check to see if something is draining the batteries too.
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Old Yesterday, 12:07 PM
TampaSteve TampaSteve is offline
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Mine was doing the same and was under warranty. Dealer replaced both batteries and the alternator and all is fine now.I discovered weak batteries after taking the truck to a Interstate Battery store and they load tested the batteries for free. I wish I could find out what was draining them but for now everything seems to be ok. Maybe someone will chime in and give us some type of direction.

Last edited by TampaSteve : Yesterday at 12:37 PM.
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Old Yesterday, 12:13 PM
mbahr22250 mbahr22250 is offline
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If you get (or borrow) a battery tester and put it inline on your positive battery terminal it should show you if you have a draw on your batteries. A small draw is normal, but if there is a 12 volt draw then start pulling fuses until the draw goes away. You might be able to narrow it down with that.
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Old Yesterday, 12:15 PM
mbahr22250 mbahr22250 is offline
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Oh... I think you have to have only one battery connected (the one with tester connected inline) for this to work, I can't remember.
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Old Yesterday, 03:30 PM
Good Enough Good Enough is offline
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I keep my SCT livewire connected over night...think this could cause enough draw to kill after 4-5 dasy of sitting?

I just can figure out my Batt light. My SCT sayins the alt is putting out 14v. It never puts outs less than 13v
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