carbed distribtor

hey guys, im hooking up the msd timing retard box for my N2o, and im not sure which wires are posative and negative in my dizzy, theres a brown and a orange and a larger black one that isnt hooked to anything, i dont have the plug ins like it should , it was like that when i got the car...my 6al is hooked to the orange and brown, but the green and violet wires from the retarder box needs to be hooked to them...can anyone help me to find out which on the dizzy is posative or negative. Orange or brown!

thanks :)
 
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i have the instructions, my 6al is hooked up and works fine, i mean the timing retarder for my nitrious...i got all the wires hooked up besides the brown one for the n20 and the wires that go to my dizzy, the only reason is because i dont know what wire from the dizzy is posative and negative, what can i do to find out? i tryed turning the key ahead with a wire tester, but i got nothing, the car probly has to be started fully?