Confirmed that the switch model is 5121. 
Insulating pins are in correct position. 
The three wires on the controller are securely wired to the switch. 
When the power from the transformer is turned up, there is a grinding sound coming from the switch. 
When I attempt to use the controller to switch tracks, it appears to move slightly. 
When I use the manual lever on the switch, it operates smoothly.

Thank you