Mods: I tried posting in Electrics, and for some reason I am not allowed to post there (?)
Can someone take a couple shots of their stereo plugs? Mine were cut and I have aftermarket plugs that plug into the original CD player.. Everything fits, but the problem is that the colors of the wires are different.. I think I have them all figured out but one..
I'm assuming you are referring to the color codes on the car (not radio) side - I don't have those and I don't have an Elise anymore so I can't pull the radio and check. Have you determined power, switched 12V, and ground? If not, I'd suggest using a meter to do so. There's not much on that plug that would be used in the Elise but those leads.
I'd guess that the red/orange is probably a power lead. If it's hot when the car's off, it goes to pin 4 on the A plug. If it's hot only when the car's on, it goes to pin 7. If it's never hot, it's likely ground (pin 8); connect the meter to a known 12V source and the suspected ground wire to double check.
I'd suspect that if you don't already have ground hooked up that the green is ground. Repeat the steps I mentioned to narrow it down.