Regardless what is new you must verify that the battery has 12+volts and get a copy of the car’s wiring harness for the starting system. First test for a good connection of the battery ground and then either begin at the starter or at the battery cable and find where current is not being carried to the starter solenoid or if it is getting there the starter solenoid is bad. Of course a faulty ground at the starter is possible but very unlikely.
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