hat may be the problem with my car mazda 5 206 the engine is not steaming why st

From what I gather you replaced the alternator? If so I'm not sure if that was the best route here. It's difficult to diagnose a car over the phone like it seems this mechanic did. If the car wouldn't crank the alternator would not be suspect yet. In this case, with so many variables I recommend using this link to find a shop near you. They can perform a complete diagnosis and get you back up and runnings. https://repairpal.com/repair-shops Alex

if I understand correctly,your alternator was bad so you put a new one on. if you were driving it and the battery light came on and lights were dim and you continued to drive it,then you were running straight from the battery and the battery drained/discharged. now,you must charge the battery with a battery charger because the new alternator won't! the alternator only maintains the charge on the battery.>>don't understand what this means?>>>will start and can't "steam" more then 3 seconds and stop even when you "matching" the.