Battery mysterious...

[Luis911]

My battery have 5 months old, when I use the mustang and park it, all is normal, but If I turn on the mustang between 5 and 40 minutes later, battery is dead, no march, then I used to jumper and mustang turn on OK, but after 40 minutes or more hours battery always ok and mustang function very well, why???? perhaps battery is warm and need cold it????? or any more???

Thanks

 

[91 HATCH]

Something is getting hot does it crank over but not start or does it not do anything

 

[86bluecobra]

Is it the starter that is getting hot and not wanting to crank?

 

[Luis911]

it seems that it wants to start, like when it is not used the car or there is cold climate

 

[HISSIN50]

Check your battery cable connections over. Then start thinking battery.

You'd be shocked to see IR readings under the hood when it's super hot out.
Heat is the biggest destroyer of batteries.

Random thoughts.
Good luck.

 

[twistedwankel]

Just drive to Auto Zone or any other big parts store and they will test your whole charging/starting system for free while you wait. Well worth the trip.

 

[86bluecobra]

My car was doing a simular thing. It would start fine when cold after a little bit of a drive it would not crank at all. It was the starter getting to hot. I replaced it with a mini starter and never had another issue. I never did try to jump it when it was like that however. I did roll start it though.