Take it back and ask for a Borg Warner R3098. It looks just like a solenoid but functions different. What you have will work but the R3098 is specifically made for battery isolation. It is rated at 200amps cont. and peak over 600. Have been using one for many years with no problems. Stinger sells what apperas to be a rebadged R3098. About $25 bucks at the parts house. Here is a pic in a buddie's X-Star.