Originally Posted by
maver1ck
I don't have a set of prints with me, but iirc, that coil is powered from the 115V output from the control transfomer. Since you mentioned you've already swapped the PSR and Spindle drive, I'm assuming you have verified that the 115V is not getting to the M20 coil. Since it is fairly obvious the coil can't pull in if the overload is open, I'll also assume you checked for 115V at the overload and it wasn't their (which would be why you swapped them).
Have you checked for the 115V going into/out of your power supply and spindle drive? If you are not getting the 115V into the PSR, seems likely it would be the fuse or relay before the power supply.