If your going to spend any money on a manual, get a downloadable FSM online.
The paperback toilet paper they sell in part stores are crap. For getting wiring diagrams and other specific info you'll need the factory manual. (10-15 $)
I read some of your previous threads to get some history and you asked about an aux backup light. Did you install it? Where did you hook it up?
You could overload a circuit if it's not on it's own system and blown out a needed fuse for the rest of the vehicle.
The power source for the relays ASD, fuel pump etc. comes from the PCM (5v, 8v). Check the gnds and battery connections like Zee said and recheck all of the fuses.
Here is the PCM connector diagram so you can back probe it with a meter.