I would have a load test performed on the charging system. It could be that the voltage regulator is not working properly or the alternator even if new may not be performing correctly. When a car is running the battery is not doing very much besides helping to support even voltage for the vehical systems, but if the charging system is not performing well many thigs will go wrong.
Your problem could just be bad connection to your terminals , i have a had that a few times , that also sounds just like a alternator problem tho , wierd if you already had it tested tho , maybe it could be you have the wrong alternator if your not producing enough amps for your accesories you will run out of power and the car will die
NEW ALTENATOR , BATTERY IS SUPPOSEDLY OKAY, BUT THE CAR SHUTS OFF WHEN I TURN LIGHTS AND RADIO ON
Ford Mustang
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General
And I don't think it's power steering
2000 Ford Mustang Coupe RWD
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General
about 1 month prior i had factory radio taken out and a cd kenwood cd player put in about 3 weeks ago it was really hot outside and it seemed to be running hot i had drips of fluid falling on my fee...
2002 Ford Mustang Convertible
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Maintenance & Repair
I have 2006 mustang and it looks like the same issue as everyone else,5 alternators in 3 years.Check charging system light came on and goes away and sometimes it stays on and drains the battery.I ad...
2006 Ford Mustang V6 Coupe RWD
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General
This is for the 2015 - 17 models and possibly the Ecoboost only.
2017 Ford Mustang EcoBoost Premium Coupe RWD
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General
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