I got this from scro a few months ago, and its a big help if your installing the 2nd battery. I have seen web sites trying to charge for the wire and directions to do this. You can do it yourself real cheap and easy. and it really cranks the starter without any issues for my system. I highly recomend this addition.The starter cranks so quick that it locks the one way bearings in the starter clutch so they dont slip and wear it down.Ive had it in about 2 months and i just checked my starter clutch no sign of any wear at all