Hey I'm trying to do a spark fence with a battery charger. I hook one lead to my fence and the other to my Metal rod. I'm getting no spark. I try touching just the leads from the charger together and don't get a spark either. Am I leaving something out? I've tried this with two chargers mine and my brothers and no spark. Went and bought a new charger today and same thing. Do newer chargers have a safety installed? Putting on a community haunt tomorrow night and I'm running out of time. The one I bought today is a centech 10/2/50 amp, 12 volt battery charger/ engine starter from Harbor Freight. Any and all help would be appreciated.