well i'm guessing it works pretty much the same as a normal cold cathose, the inverter should have a very small plug on it that's the 12V +ve and -ve in and the slightly larger plug on the other side should be the 100V ~AC out, you sure you dont have any conectors or anything? did you check the contence of your package with a packing list incase they missed something out? anyway.. if it's just cheep you can still use it, it's just a case of bodging the wires a bit, you may need some chop-blocks, electrical tape and some plyers. what sort of connection do you have on the string? do you have aterminal or a wire each end?