Ok here we go, i am having problems with the charging system in my 90 mustang g.t, there are times that the car will crank right up but if you drive it for a period of time and park the car it acts as if the battery is dead and then at time the battery will be dead and wont start the car at all. my car has no dome light or the lights in the sunvisors i disconnected them all togeather and im' still having trouble.I have changed the alternator and battery i went as far as changing the connecter on the alternator thinking maybe that was the problem but still no luck its got me to where im about ready to just get rid of the car but i really like it so i hope someone here can help me out thanks

 

there is something in your car causing parasidic battery drain SOMEWHERE....did you have a professional mechanic look at it?

 

You need to do some testing and see whats going on voltage wise when the car is off to see if something is draining it. I would also test when the car is running and see what voltage your getting to see if the alternator is doing its job. I mean really there are a lot of tests I would have to do to get an idea of where to start looking for problems.

 

thanks guys I have done some test but all show nothing,I'll check a couple of more things