Question about 2004 Ford Mustang

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My 1997 Mustang GT had a dead battery. I charged it and had power when I put the key in the ignition. The engine light and battery light came on but the radio and windows all worked fine. When I turned the key to start the car I lost all of my power to the car. There was no clicking at all either. I cleaned all of the terminals and checked all of the fuses, and everything looked fine. I took the battery to get it tested and it tested ok. I charged it again and the same thing happened again, no power when starting. I left the key in for a few minutes and I got power again. I jacked it up and had my dad tap on the starter a few times and the starter clicked a few times but the car would not turn over, and it then lost all power after several attempts. No lights or nothing. I left the key turned to accessories and I went to take the fuse box cover off and I had power again. I think there is a short in the electrical system somewhere. Any ideas?

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  • bh121fa Mar 19, 2011

    I put a new battery in and replaced the starter. Still having the same issue. Starter clicks and then the car loses power, and then it comes back on two minutes later. I am going to try replacing the switch, if that does not work then the battery cables.

  • bh121fa Mar 19, 2011

    I replaced the battery and starter. Still doing the same thing. I will try replacing the switch, if that does not work then the battery cables from there.

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  • Ford Master
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Switch is bad from what I can figure out with a multimeter. Some time ago, I heard that the car wouldn't start unless they put the key alomost back to the run side then it would fire. Them replaced the switch and all works fine now.



Hope helps.

Posted on Mar 17, 2011

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  • Master
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You mentioned having the battery tested, but if only the voltage was tested that isn't adequate to determine the batteries condition. You need to have it load tested. This is done with a special piece of equipment that applies a simulated cranking load to the battery while monitoring the voltage drop. If it drops below a certain level this indicates one or more dead cells in the battery. If the battery has one or more dead cells it will need to be replaced.

Posted on Mar 17, 2011

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03 Mustang GT (Parasitic) Battery Drain Fix
welcome.gif
Hello,
I am seeing a lot of mustangs are having battery draining issues and I wish to share some simple solutions found while working on a friends 03 GT 4.6ltr.

In a quiet area, key switched off, hood up, Listen carefully close to alternator. I heard a high pitched hissing/whistle sound at low volume, came from back of alternator. This sound was the voltage regulator/rectifier staying on when key is off due to faulty diodes inside the voltage regulator/rectifier circuit, can cause battery to go dead after car not ran in about 2-7 days.

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thanks.gif for reading,

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