Battery and alternator check OK.

Battery dies overnight. Getting continuity between battery negative (connected) and positive cable (disconnected). Nothing appears to be on.

Pulled fuses in power distribution box one at a time with no changes.

Ideas of where to start.

Thank you

 

You might get a better response by posting this in the forum for your Mustang model.

How long has this been going on? You could have a short somewhere causing the continuous drain. Or, your battery might actually be bad. Have you had it load tested? What voltage are you getting on it when the car is off and on?

 

Its never done it.

It popped the radiator, had it towed home. Went to pull it into the shop 2 days later and it was dead. Jumped it and all was fine. Replaced the radiator...and it was dead again. Im seeing nothing left on, including trunk and glove box light.

Load checked the battery, and they charged it. It started right up, and Im getting 14.3 volts when running. Pulled the alt anyway and it checked "good"

 

So this started with your radiator issues? If so, that will help narrow down where to start your search.