Motor not cranking 750 sxi pro

Location
Broward
I just put in my motor from changing the driveshaft housing ( it ran perfect before I pulled the motor). Im hitting the start button and it does nothing, not even click. But whenever I put a screwdriver on the solenoid posts the motor starts turning over.... any thoughts?

edit: I failed to mention that I mixed up the wires for the battery and put negative with positive, vice versa. But after I switched it back this happened.
 
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