2001 galant with new battery and new starter will not turnover. on 2001 Mitsubishi Galant

Turned over fine for a week after new starter and battery installed then it quit turning over. New battery discharges, however, I chagred it back up and still it will not turn over. All connections are tight. Something causing the battery to discharge and something not allowing the charged battery to turn over the starter.

Asked by for the 2001 Mitsubishi Galant