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2005 Mustang GT Charging Issues

6276 Views 12 Replies 6 Participants Last post by  AlaskanWookie1
Hi all,

I am new to the site and I am looking for some help with an issue I am having. I have a 2005 Mustang GT with an automatic and a Shaker 500 sound system.

The issue I am having is dealing with the charging system/battery. I never had a problem with it starting until about 1 month ago. The car turns over very slowly and acts like it is not charging. I have no warning lights on in the dash or anything. My charging gauge is working fine as well.

I bought the car used and had the alternator replaced about a year ago along with the battery (Both Motorcraft) under the dealers warranty.

The slow starting problem will go away if I drive the car for long distances without stopping (20 or 30+ miles at highway speed) but if I am sitting in stop and go traffic or only drive the car for 15 or 20 min the problem will come back. I just got back from a 2000+ mile trip and had no problems, but as soon as I went from my house to work and back (6 miles) the slow starting problem came right back.

I had Ford test the battery and they said it was fine. The battery voltage read 12.6v.

Has anyone had this problem or know of someone who did? If so, do you know how to fix it?
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I've had your problem and the same non-existant warranty on the Motorcraft battery wasn't worth the paper they wrote it on. Believe it or not, your car is designed to "go to sleep", just like your computer. If you have anything plugged into your power points or cigarette lighter socket (other than the lighter unit), then your car detects this power drain and remains active pulling a lot more juice than when it sleeps. I started unplugging my power points and have no more problems. This is the info I got at the dealership and it appears to work for me. I had a radar detector and GPS and MP3 player all plugged into 2 power points and it was always going dead. It finally ruined the battery which I replaced and no more problems.
Oops, and yes, the alternator should be pumping 13.6 to 14.3 volts to your battery.:bigthumbsup
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