I have been lurking for a while but now I have a question that should be easy for the experienced mariners to answer. My CHB 34 has a hinged radar/light mast which allows me a covered slip. It is a struggle to raise and nearly impossible to lower single handed. As a retired engineer my solution is to install a hydraulic cylinder powered by a 12v pump. In addition to the + &- connections there is a ground lug. On a automobile I would connect the ground wire to the block. I believe that is the same with a boat. Am I right?