A friend gave me a new OFNA 12volt starter box he no longer needed. I went to my LHS and purchased a dry cell battery. I charged it and went to try it. I had to reverse the pos/neg on the battery to make the rubber wheel spin the correct way to start my truck. My question is, when I plug in the battery charger do I still hook up the Neg to neg, pos. to pos. Also I tried to get the manual on the OFNA web site,with no luck, so I was wondering if I can reverse the polarity on the motor itself and change back the battery to the right polarity. Thanks, Scott