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

Go Back   MustangForums.com > Ford Mustang Tech > V6 (1994-2004) Mustangs

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

"04 3.8 Mustang killing battery..

Thread Tools Search this Thread
Old 09-21-2013, 09:23 PM   #1
Join Date: Sep 2013
Vehicle: 2004 LT
Location: NC
Posts: 1
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
schlepprock is offline   Reply With Quote
Old 09-21-2013, 09:46 PM   #2
4th Gear Member
Daehawk's Avatar
Join Date: Mar 2010
Vehicle: 2001 Ford Mustang V6
Location: TN
Posts: 1,511

Sounds right to me. Get the alt rebuilt. May need both diodes and brushes. Im surprised it lasts 7 months.

2001 Satin Silver Mustang V6
BBK Power Plus 70mm throttle body
Mac cold air intake
MAC long tube headers
MAC off-road H-pipe
MAC true dual exhaust
American Racing 5 spoke 17"
Nexen N3000 255/40ZR17 tires
MAC white face gauges
Cobra front end

My exhaust videos:

Daehawk is online now   Reply With Quote
Old 09-22-2013, 08:38 AM   #3
2nd Gear Member
Dr.Le's Avatar
Join Date: Mar 2012
Vehicle: 99,v6
Location: CA
Posts: 164

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.
4.10 Gears, 10inch 3500 stall, Jmod, True dual, ASP pulley, Ford B springs + tokico blue, MM XL subframe, SCT Bama...

Collecting Parts for a Windstar kit
Dr.Le is offline   Reply With Quote


Similar Threads
Thread Thread Starter Forum Replies Last Post
**New...from NAT! 2015 Ford Mustang MRT Rear Window Louvers**Free shipping! NorthAmericanTuning Vendor For Sale / Group Buy Classifieds 5 11-09-2016 12:45 PM
**New from NAT!2015 Ford Mustang MRT Rear Window Louvers**Free Shipping! NorthAmericanTuning The New S550 2015-2016 Mustang 3 03-18-2016 12:21 PM
Horsepower History: Mustang Power Numbers Through the Years MustangForums Editor Mustang News, Concepts, Rumors & Discussion 8 01-06-2016 08:03 PM
New from Pittsburgh chain New Member Area 6 08-17-2015 09:52 AM
Just swapped motor exhaust want fit daytooday Motor Swap Section 2 08-11-2015 10:22 AM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 06:42 AM.

This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company