Start by cleaning and checking the connections from the battery to the solenoid. Jump a wrench between the solenoid terminals. The large ones. If that cranks the motor, its not the starter.
From the sounds, it's a weak/discharged battery, or a bad connection from battery to solenoid.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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