Battery Light

[Good Enough]

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...

[Good Enough]

Any help out there?

[urname7698]

Double check the output of the alternator, check to see if something is draining the batteries too.

[TampaSteve]

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.

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Last edited by TampaSteve : Yesterday at 12:37 PM.

[mbahr22250]

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.

[mbahr22250]

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.

[Good Enough]

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