Suzuki: Alternator?, suzuki sidekick, jlx

Question
My 96' Suzuki Sidekick Jlx Sport battery has been charged. My cables are good.  And the car will take a jump but as soon as I shut power off. Nothing. No clicks so semi starts.  The starter in it is 1yr old so I am to guess it's the alternator???

Answer
Do the headlights shine brightly?  Are the battery posts, and the inside of the cable ends clean?  The fact that it takes a jump indicates that the electrical connections from the battery terminal clamps to the motor are good.  If the battery is good, and the connections are clean, the headlights should be bright.  It might be a good idea to have the battery tested under load to see if it can supply enough to operate the starter.  The battery may be fully charged, but not be retaining enough energy to operate the starter, as in a marginal or worn out battery.
scotty