[metalsteed]

OK, after having the alternator checked while operating in the vehicle it was found to not be putting out the amps at mid and high rpms. I removed it from the vehicle and tested it... it PASSED! I reinstalled it and disconnect the negative side of the battery, puff... Dead. Tried it several times and as soon as the negative side was removed the engine died. Might it still be the alternator, the regulator, or both. I understand that it could be grounded improperly from other post. Any thoughts?