Power Window Wiring

[playinsafe44]

I just got some full power doors off of an '87 blazer, but I don't know the best route to do the wiring. I also pulled the wiring out of the blazer to put in my truck (with the relay). I just don't know what is hot, ground, constant, or switched... This is going on my '73 Chevy, so it has the buss (bulb) type fuse block on it. I also read somewhere the there is a relay mod that can be done to make the windows work better, and I would rather install it that way if I can. Thanks!