If I recall they look the same but I have black electrical tape on the one because it's the only hot wire. I think I need to have the hot wire and the white wire ( which I think in the front is connected to the stop lamp switch) wired together at the rear and the other grounded and should work, right? Haven't been able to try that combo yet. Maybe my guy has a wire hooked up wrong in front regarding the purple wires, it seems they should be for the signals though. I'll have to check today