That's a old cable unit. You may have to adjust the cables.
First plow I worked on was one of those, to say I was confused would be correct.Yes I learned about how to take care of that setup. I had a truck that I would pull the mount,pump and lights off every spring and reinstall every fall. I know sounds like a lot but wasn’t really that bad. In doing so I had to disconnect and reconnect those cables and adjust!