that looks like the same one i've got screwed into the seirra

if you can wait till tomorrow afternoon i can see what's wired in where (it's tucked up in the drivers side glove box so all the wires go through the dash and into the ignition loom)

but i'm pretty sure that two of them will connect to the coresponding wires in the ignition switch, one for keeping the power running when oyu switch it off and one to the earth side

there should also be one that kills the power if youdrop the handbrake, it's a sort of anti-robbery thing if you leave the car running and wander off and osmeone else jumps in to run away with it