"04 3.8 Mustang killing battery.. - MustangForums.com

V6 (1994-2004) Mustangs Technical discussions on the 3.8L and 3.9L V6 torque monsters

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Old 09-21-2013, 09:23 PM   #1
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Default "04 3.8 Mustang killing battery..

Hey guys,my brother has an 04 Mustang LT with a 3.8. He says in about 7 to 8 months it will kill the battery,any thoughts on this? He said the knucklehead at Autozone told him the diodes in the alternator were going out..Thoughts?..Thanks in advance..Phil

I don't have a stang,but I'm a Superduty diesel guy,still Ford brotherhood..right?..LOL
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Old 09-21-2013, 09:46 PM   #2
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Sounds right to me. Get the alt rebuilt. May need both diodes and brushes. Im surprised it lasts 7 months.
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Old 09-22-2013, 08:38 AM   #3
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can you check the battery w/ a volt meter?

one w/ the car off (i think it should be low 12s)
one w/ the car running.(i think this should be mid 13s)

check if the battery also hold a charge to rule out if its the battery or the alternator.
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