Take an ohm meter see if you have continuity to ground if you don't see where it's broke.

 

Check your controller to make sure that it is working properly.

 

The common ground that you have circled in the picture has a brown wire that attaches to the remote receptacle on the control pack cover. The small (red) ground wire that is attached to the main ground bolt on the underside of the motor is also attached to the remote receptacle. The grounding for the solenoids is an open circuit and not completed until the remote switch is toggled in or out.

Inspect the pins in the remote receptacle for damage. Tug on the wires on the backside of the receptacle and make sure they're secure and not pushing out of the socket when the remote is plugged in.

Push on the five pins in the plug on the end of the remote and make sure those are secure and not pushing back into the plug housing when the remote is plugged in.

Have a friend with a 5-pin remote that works? Easy way to eliminate the remote. If not, maybe you have a shop nearby that sells winches that will let you borrow one to check.