6.0 charging problem

[powerking]

I have a 2005 f-250 the battery light came on had the alternator checked it checked good took a voltmeter and it was reading 14v i can charge batteries and it will run fine but if i leave it overnight the batteries will be dead could this be bad batteries or something else.

[powerking]

had the batteries checked after charging and they checked good what should i check next any help would be appreciated

[Brody133]

Probably batteries. Batteries will lose their charge sitting overnight. Since you checked them after charge they'd read fine. Check them after you let them sit overnight and see what they read out to be.

[russf]

If you had them load tested and they came out fine, then they are probably fine. I draw can also cause batterys to be dead over night because sometime is drawing current from them while it sits. But if your battery light came on, more than likely that is always an alternator.

[powerking]

This is where I'm at know the battery light would come on and go off I believe I have found a short in the wire that runs from alternator to battery using a voltmeter it was showing a draw of 9.38 and when I unhooked the wire from the battery the draw would go away so will see if that is it or not

[Errick NDA]

When you charge a battery you cant test it right after a charging ! It needs to sit for 2 to 3 hours to get a accuate reading ! If you check it right after a charge what you get is a surface charge reading !

[Brody133]

Originally Posted by Errick NDA

When you charge a battery you cant test it right after a charging ! It needs to sit for 2 to 3 hours to get a accuate reading ! If you check it right after a charge what you get is a surface charge reading !

That's what I'm saying.

[Brody133]

If your alternator checked out fine I don't know what else it could be.

[powerking]

can anybody tell me what this silver thing is and what it controls my batteries have been dying overnight and with a voltmeter it was showing there was a draw from somwhere so i finally got to this thing and unplugged it and the draw went away it is located on the passenger side valve cover on the 6.0

[dannyboy950]

Looks like the glow-plug controler. Yup if that has a short it would definately draw your batteries down.