Welcome, I am Chris (aka-Moose)
Disconnect the large wire on the starter and secure it so its not touching ground. Reconnect the battery. Now test the small signal wire to the starter. It should not have power. If it does then there is a wire short where as a power wire is powering the starter signal wire in the harness. If the small signal wire does not have power then its your starter motor and solenoid that is faulty or the the wires are connected incorrect on it if the starter was recently removed.
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