3 accessory wires on 02 expedition

Well,

I started an install on my expedition. There is only one ignition wire and 3 accessories. I am installing a python unit (forgot the model#) but is has an output for the ignition, accessory, and then the pink/white which can be programmed for either 2nd accessory or 2nd ignition. I really dont want to wire up another realy for the third acc, seeing that I am out of them and all three radio shacks near me are out. Does anyone know what each accessory wire does? I just want to pick the most important 2, I would figure one is for the blower and the others are for the electronics. I am unsure, possably all 3 need to be wired. I am not worried about the radio and such being on, just the blower for the heat.

The three wires that are listed are:

1) RED / blk

2) Grey/yel

3) BLACK/ Grn

Thanks in advance.

J

Just what I needed

Thanks for your help.

J