Stalling problem and battery light

You need to find a friend that has a modus ultra and see what the alt is doing in real time, the charge circuit is controlled by the pcm, to charge full on start up, and surface charge to maintain amps under full charge conditions, inspect inside of connector (plastic) for corrosion or melting, also due to wire placement break inside the insulation and work intermittently until engine bay heats up and softens insulation. Hope that helps.

You got lucky!! You should never EVER disconnect the battery with the engine running!! Doing so creates a power surge that can fry the PCM, among other things!! Don't do that again!! When the "battery" light comes on it's telling you the alternator is not charging the battery. Not that the battery is dead or bad. Replace the alternator. It may be drying and testing ok but in the "real world", under the hood, it may not be performing as it should. With electrical problems things may work perfectly in certain conditions, like when their cold, but break down when they get hot. Ignition coils, for example, are notorious for that. Also check your serpentine belt. Make sure it's not slipping and the tensioner is not at the end of its travel indicating that the belt is worn out. Hope that helps! Jim

I've changed the tensioner the belt was fine we also just changed the alternator nothing is changing makes me belive there was nothing ever wrong with my battery are alternator it has to be something else ...I already had the ground wires changed