so i got this problem... i have a 99 v6 mustang. i been having problems starting my car.. just on friday i was stranded becausse my car would start then shut off start then shut off multiple times.. i will finnally get it started and it will shut completly off when i am driving.. i went to autozone to check my battery they said it was bad so i got a new one i put it in my car and still has the same problems.. its started with the new battery it stayed on and then i put my headlights on and it shut off... i was thinking the alternator but i removed the positive post and my car kept running soo i have no clue anny comment or answer i would appreciate thanks

 

so the car is running good with the alt disconnected have you brought it to see if it is alternating any dc current? do you have a multimeter handy if it doesnt ohm out its prob bad

 

Any codes?? Seems like a charging system or ignition system problem. If you have a multimeter hook it up while its running to see the voltage. If the voltage is within range (I cant remember I think 13.5-15.5Vs???), then while its running unplug each connector to your coil (on top of spark plug) and if you find any cylinders that do not affect the idle then there is your problem.

 

i didnt disconnect the alt dude i disconnected the positive battery post.. and can autozone check the alternator???

 

Yeah I am pretty sure, I think they will bench test it as well as check the voltage with their multimeter while your car is running. If you cant drive it there, then obiosly take the alternator with you.

 

okay man soo yalls guess is that it is NOT the alternator??

 

Well it could be, get it tested. How is the voltage meter inside the car? Any lights on in the dash while its running poorly?

 

well you said disconnected the positive post after the word alternator i guess i read it wrong sorry, and yes auto zone can check that out for you they will hook it up to a machine and will see if it pulls any current,
i had that same problem when i owned my first 98gt it left me on the interstate

 

snake lol man i just got stranded in a neighborhood.. and volcom when it is running none of my gauges work! and my lights are SOOOO dim.. and before all of my electrical stuff would shut off ( gauges woould go from bottom to top and radio would shut off and lights would flicker)

 

if it was a coil pack the car would miss really bad and the way to trouble shoot that is unplug one at a time wile the car is running and if the one coil you unplug doesnt make the car idle any worse meaning that if it runs the same thats a bad coil if thats the problem then i would buy msd coils there an upgrade and have a full life time warranty and you can replace them anytime for free there only like $325 on www.jegs.com or www.americanmuscle.com