Quick Question on buddies probe

[U2SLO]

My buddy has a 95 probe GT. IT died on him the other day while he was driving, dumped the clutch in second and started right up. Once the rpm's drop the car dies. He has a big sound system in it, so im guessing thats sucking all the juice. He either has to jump it or push start it. Would this be alternator, battery, or starter?? Thanks

[1990pgl]

both once a battery dies you might as well get a new one soon. there is a shop over here that ca make or 90amp alt a 200amp alt fairly easy

[Caffeine930]

what is it doing when he tries to start it is it clicking? does it even turn over? whats the battery gauge say?