Question about 2005 Ford Mustang

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05 4.0 mustang alternator only charges after car has been running for awhile.

I start the car after it has been sitting for several hrs, the battery light comes on, after a few minutes the lights start dimming then shut off, the clock shuts off, everything shuts down to keep the engine running. All of a sudden there is a click, the battery light goes off, the dash lights get bright again and the clock comes back on. At this point I know the battery is charging again.

Posted by Chris Bullen on


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JonSnell Electronic

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  • Ford Master
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Check the alternator is functioning correctly.

Posted on Aug 14, 2017


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SOURCE: 1993 Ford Thunderbird- New battery & alternator & car won't start

Did you clean the cables when you changed the battery?

I'd trace the wires connecting your alternator and battery and make sure they are "healthy" and securely fastened. Then, I'd check the wires connecting your battery and starter. Again, make sure the wires are securely fastened and appear clean.

The starter and solenoid are one unit for this vehicle.

Hope this helps and good luck!

Posted on Jan 13, 2009



  • 37 Answers

SOURCE: my alternator is over charging and damaging my battery


Posted on Apr 05, 2009


Sudeep Chatterjee

  • 3267 Answers

SOURCE: Not charging enough to keep battery charged and no dash gauges

The battery charger circuit has failed. If it has a fuse, see if its OK. This input comes from the dynamo, but if your headlights work, then the dynamo is OK. If you are not familiar with the electrical system like checking the leads with a multimeter then best to have a technician(vehicle electrical technician) to check it and if the fuse is OK then the rectifier may require replacement................sodeep

Posted on May 09, 2009


  • 155 Answers

SOURCE: battery not charging

check the fuses in the POWER DISTRIBUTION BOX under the hood, There is a 75A in-line fuse and #11 - 15A fuse see if they are good.... test your alt. loom for opens, and cables .....hope this helps...GL

Posted on Jul 06, 2009


Ronny Bennett Sr.

  • 6927 Answers

SOURCE: My 7.3 L diesel ford

You must have an older vehicle,but I am pretty sure the 7.3 was put out after the voltage regulator was put in the alternator.What you are describing is a voltage regulator on the the firewall.If this is so,replace the voltage regulator on the firewall,with a new one.This will be the problem most likely.The voltage regulator on the firewall should be kind of flat,almost square,and a wide plug,goes all the way across the voltage regulator.If You don`t have external regulator,then it is built in the alternator,and the alternator you purchased is bad.Be sure the wires on the back of the alternator are not broken anywhere.The big post ,largest wire,on the back of the alternator is the out put wire.It should go to the battery.If it does not have 13.65 to 14.25 volts on the back of the alternator,and at the battery positive post.Like I said,I believe the voltage regulator is on the firewall,if it looks like I described,then it is a regulator,replace this part(voltage regulator)and it will solve your problem.I hope this was some help,please let us know,thank you.

Posted on Oct 16, 2009

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