How do you wire LEDs to three 10" Subs?

I have been trying top wire my interior under the seat lights to my subs, but for some reason it wont work. My friend has them wired to his last sub in the circuit, but that wont work for me for some reason. I've tried connecting them to an open speaker port, to the subs themselves, and everything with no luck. I know the lights work so please help me! I have three Rockford Fosgate HX2s, and if anyone knows what I may be doing wrong or of any good diagrams, please help!!