Hi guys i'm a new user this is my first time on here. So here's the problem I have a 2007 Ford Mustang, and recently it shut off on me. I thought it was a bad battery, however when I took it to advanced auto and after running running a systems test, turns out the battery was fine, however since it was under warrenty I replaced it (battery is an optima rated at 720, but running at 890). So what the problem really was was the alternator. So I got that changed, but only after installing it I found out the sales rep by mistake gave me a refurbished which proved to still give me problems (example the battery light wouldnt go away, and turned out it wasn't charging the battery during standstill and it would vibrate bad at idle) so finally I changed out the alternator for a new one, and now although the battery sign and the vibration at idle is gone, now ther is a new problem. It is the same exact problem as burrosito stated. Now when ever I accelerate even a bit hard, all the electrical instruments and stero shut off and restart. And it will stay that way until I let off the pedel. Is there a simple solution to this, I really do not feel like getting the alternator changed again. Can I not just replace the sensor or something. Thank you any help is greatly appreciated.

 

Sounds like a loose connection somewhere, not an alternator issue. I’d start at the battery terminals and make sure they are clean & tight. Then look around to see if there are any damaged wires around, wiggling the wires to see if the problem reproduces. Other then that you’d have to poke around with a volt-meter to find the problem or pay someone to do it. It would be hard to diagnose it from our keyboards. Good luck...