so the car shuts down after I turn on the AC and the lights. I already tested the battery and the alternator and everything is good.is there any guess as to what it could be. Could it be the belts or maybe another electrical device.

 

AC and lights....what about just the lights or just the AC? Hook a volt gauge at the battery and see what reading you get when turning those on. Then see what reading you get at the alternator.

 

I took it to several places, strange thing, first place said it was battery. Second place said the alternator. Third place said both are ok, same with the fourth. Fifth place too. I d

 

Ok I replaced the alternator and two coil packs. The cars battery gauge show low when idle when i turn on the AC and the lights, of course when there turned off the gauge stays in the middle...don't know what else to do.

 

Check voltage output right at the alternator. If you're getting 14 volts or better, the issue is with your wiring and or connections leading to or at the battery.