Hi; Sounds as if you may be having battery problems. The rapid 'clicking' noise is generally caused by low voltage (starter solenoid or relay clicking). The battery terminals may be too dirty to allow a charge from your charger, or it could be just a weak battery. Most places that sell car batteries will also check the charging system at the same time. Hopefully, you do not have a short in the vehicle that is draining the battery overnight. This, also, is an easy test.
Good luck.