6.0 alternator problem - Ford Powerstroke Diesel Forum
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Old 12-29-2010, 10:07 AM
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6.0 alternator problem

my alternator was originally only putting out about 12 v causing my batteries to go down, i replaced it with a rebuilt one from advanced ( from reading the forums i know better now) the alternator light came on after i put the rebuilt one one, i took it to another parts store closer to my house to check the volts and again around 12, then i went to were I origanally bought my new one and when they tested it it had dropped to 11 v, we looked some info up on their computer and retested the alternator again and it had dropped down to 9 v, i left my truck running while i was inside. then i found out that the alternator they sold me was for a 7.3 and mine was a 6.0, but it all mounted the same, could that cause a problem? any help would be greatly appreciated on this problem. also when i charged my batteries out of my truck they would reach 100 percent charged, then the next day when i would check them they would be back down to around 60-70 percent again, when tested the cells were good????

Last edited by BigLee; 12-29-2010 at 10:32 AM. Reason: added more info
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Old 12-29-2010, 10:13 AM
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How old are your batteries?
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Old 12-29-2010, 10:21 AM
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november of 08
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Old 12-29-2010, 10:32 AM
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3 years they might be bad but an Alt not charging right would not be good. The last truck I did we replaced both batts and put in 2 different Alts before it would hold a good charge.

When you say checking AMPS how or what tool are you using to do this?
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Old 12-29-2010, 10:34 AM
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sorry, i ment volts coming from the alternator, could the new alt possibly be bad also
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Old 12-29-2010, 10:36 AM
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also if the new alt i got was supposed to be a 7.3 with dual alternators, think maybe that could be causing the problem when it warms up
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Old 12-29-2010, 10:45 AM
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Ok now I understand.
Take the new ALT back and have them test it. It Should come back 13.6 -14.0 volts. I am not sure if a 7.3 and 6.0 Alt are the same. My guess is that they are. Go and get 2 new batteries. I do recommend Motorcraft because they have a really good warranty for 5 years. That will fix you up. Just a word of caution bad batts / alts will kill your FIMC and that is a $500 part at a min.

If you want a higher output ALT setup get a single aftermarket HO one. That one is on my list of upgrades.
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Old 12-29-2010, 10:49 AM
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thanks, going to buy new batteries now and taking the old alt back
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Old 12-29-2010, 10:51 AM
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Have them test the new one too before you leave the store!
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Old 12-29-2010, 10:54 AM
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will do, thanks
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