Okay so this is the first real problem I've had out of my mustang. It loses all power to the electronics and shuts off the engine while driving and I just had my alternator tested but it's good. My battery is pretty old and i think i might have some wiring issues as well. After jump starting the car, it will run for about 10 minutes then poof, nothing. it is a 2003 V6 3.8L.

 

Replace the battery first......

 

If a car engine shuts off while driving, this signifies a pretty serious problem. This might be from the engine not working properly, the car being out of oil, the car being out of gas, the fuel line being damaged, having water in the fuel filter, and much more.