I get 6.5v DC coming from the PID to the SSR and no matter what setting it's on I can't get any power at the output side of the pid.
I am assuming you mean SSR.
Based on your drawing do the following:
Remove the red wire from your SSR output side and connect to the red terminal block.
Install a wire from your black terminal block (Hot) to the SSR.
Remember the SS functions as a switch and requires hot on one side.
Install a fuse in case the SSR fails.