My mustang will be driving fine then all of the sudden all of the power goes out. No power at all. Has anyone had this happen to them and how to fix it? Thanks

 

Did this happen once and it won't start again or does it do it, then set for awhile and start agin?

 

No power at all, as in no interior LEDs, idiot lights, etc?

Should that be the case, then the obvious comes to mind. Battery terminals, if not that, then the main ground from battery to chassis.

I'd make a habit of a once every year or two doing a grounding point contact cleaning as well, with some sandpaper, and di-electric grease over it once re-done. Most grounding points are easily visible around the front of the vehicle when the hood is up, including one for the fuel.

Alternator issues are fairly common, but the interior LEDs should still have enough juice to show.

 

It has happened a few times now. When it shuts down there is no power whatsoever, like my windows will not even go up or down when opening the door.

 

No power at all as in nothing. No lights no window going up and down when i open the door cant get it out of park nothing. I can jiggle the negative wire it seems like and it will get power again and start up like nothing is wrong. My stereo and stuff resets everytime so its a total shutdown of the car. So you can start down the road again untill it does it again, sometimes 30 seconds sometimes an hour.

 

Sounds battery related and or possibly alternator. I would clean all terminals. How old is current battery?

 

Battery or battery cables.

 

Before you do anything else clean the terminals you would be surprised how many people think they have a dead battery and this turns out to be the problem, let us know if this works.

 

+1. Without a doubt electrical in nature

 

Battery is fine, as likely is the alternator, contact points for the main + or - terminals, the main grounding line, or one of the main wires themselves are your culprit.

I know the main factory ground line from the battery to the chassis on mine is lookin' fairly sad as the angle it's on promotes corrosion beyond the insulation itself. Probably replace that on my own later.

Can you specify which ground/- your "jiggling" to get it to work again? Obviously, that's what you'd likely wish to focus on either replacing outright, or cleaning the contact points on. But others could tell you for certain what it is, and what you will need to do if you can snap a pic, post to imageshack.us, or point it out on another diagram/picture.

This is not only not good for the obvious reason of your car not functioning randomly, but that likely means a butt-load of added resistance is being added on one of the main cables to get power when it IS working.

Not good. Betting you could find the culprit fairly easily, as it will be one of the main cables that is far hotter than it should be when it's running, if this is indeed a case of a corrosion and not just a loose/broken connection.