Voltage Reducer Problems

[jakesnake27]

I just bought a 48v to 12v reducer off the internet. Here is the link: http://everythingcarts.com/p-1150-vo...2v-10-amp.aspx I hooked it up just as the directions said. All I have it hooked up to is two 12v headlights. When I go to turn them on, the reducer makes about five loud clicks before the lights come on. When they do come on, they work fine. I also noticed when I was wiring it up, that the negative wire that hooks to the battery pack made a big spark. That may be normal though. I don't know if I wired it up wrong, or this is all normal. Please help.