I am with Baldie on this disconnect it, the only way to run four lights is with a four pin relay using that wire you gained your power from to switch the relay, which will have a direct feed from your battery to it and a supply for your spots and the fourth pin will be it's own earth, as Baldie says the packet it comes in will tell you which pin on the relay is the switch, supply, feed and earth. But disconnect what you have done now until you get a relay.