Shutter control

The wiring was indeed reversed. I swapped the wires for the sensors and that fixed the open sensor, but the closed sensor reports shutter error all the time. The sensor seems to be functional, I get continuity in one position and none in the other. I cannot complete calibration with the shutter, when I try, the shutter moves about 20% and stops. Repeating about 3 times get to the open sensor and stops the motor after a few seconds of the clutch slipping. When the shutter tries to close, it only goes about 10-15% of the way and stops. starting calibration again results in the shutter opening all the way and starting to close, but only a little way. The rotation operation calibrated fine and seeps to be operating normally. I am at a loss to get past this. Any ideas? Thank you, David Messier