Question about 2005 Ford Mustang

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Having trouble with starting, battery is down sometimes, but the battery was tested and is a good battery

Somtimes my car will not start. My battery is dead. I dont know what is causing this. I had the battery tested and they said that the battery is perfect...Do you have any idea what would cause this??

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  • wannaberich8 May 22, 2009

    i dont know. the engine doesn't even attempt to start. it just clicks. But the last couple of nights i have turned off the radio before i turn off the car and that seems to help some. But im not sure why.

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  • Ford Master
  • 5,520 Answers

Make sure your battery is clean including the case. Since summer is approaching remove the fuse to the rear window defroster. If you don't have a problem after this most likely it is the rear defroster switch which can be turned on while you wipe the dash. It can defect in a way that the indicator light will not go on, yet it will be on. If the battery is drained again you need to disconnect the battery terminals and connect an ohmmeter to the loose battery cables, bypassing the battery. With any luck the ohmmeter will show a connection. Then it is just a simple matter of removing fuses until you find the fuse that breaks the connection. Remember to turn off the radio and AC/Heat controls first to see if the fault is there. If you don't have a diagram for the fuses, after you find the suspect fuse, leave it out. Then remove the ohmmeter and reattach the battery cables to the battery. Start the car up and whatever does not work is what that fuse controls.

Posted on May 22, 2009

  • fordexpert May 23, 2009

    Several autoparts places like Autozone,Murrays, O'Reillys can test your system for free. They can check your starter, alternator, and so forth. Its true it can be draining more or charging less. If this is your only car you might want to spend $40 for a portable jumpstarter with an airpump and emergency light. It is not a fix, but you will have a chance at starting it and a light to put on if you're stranded.

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  • Master
  • 326 Answers

Alternator
OR
Bad ground/short.

Does everything electrical function correctly?

Do you have drastic drain/dimming while using multiple accessories?

Have the alternator tested at a parts-store. (Charging system test)

Posted on May 22, 2009

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  • Ford Master
  • 6,982 Answers

Have your charging system checked. A good battery is like a bucket with a small hole in it. the water would be electricity (charge). Under normal conditions your alternator keeps the bucket full without overfilling. if the alternator isn't working it becomes low and won't start the car.
Also have your starter checked for excessive draw...In this case the starter is asking for more power than the battery has or can have. If you have a hand held volt meter you can do this testing yourself. If you need help with that just ask. Also, you may have something staying on in the car...there are tests for that as well.

Posted on May 22, 2009

  • Richard Scordino May 22, 2009

    You need to do some testing, or have someone do testing for you. Not starting falls into three categories...dead (bad) battery or bad connections, poor or no charging or system drain, or bad starter.
    Aside from being dirty from use, bad parts look exactly like good parts...The only way to tell them apart is by testing. The turning off the radio thing points towards a system drain, but may be an incorrect assumption at this point.


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