I hooked the relay pictured below from my dc converter to give it 12v then I grounded it on the last battery in my series pack. I put 72v on one of the poles to be transfered to my aftermarket controller turn on wire. That way I can still turn the controller on from the keyswitch. It worked running on the stand then I took it for a ride got to around 30mph and the relay blew. I also blew the fuse I installed from the 60v tap to the dc converter. I was wondering if anyone could tell me why? It said it could handle 125vdc unless I read the package wrong.