There is an overview diagram... and then seperate diagrams for different areas.

You need to look at the main/ front harness and the engine harness diagrams mostly. There will also be connector diagrams that sometimes help figure out what could be wrong.

If you do detailed list where you are not getting power it will help narrow it down.

ok gotcha...thank you soooo much. ill keep you updated.

one other thing is that car has not run since enjine refbuilt and it just crossed my mind that it never use to do this. the fans are on high speed when i turn key on no cranking and my battery drains fast. something aint right there...i need to look that up as well dont cha think.?

Lol... yep...

Fans could be wiring or the temp sensor. Or the ECU if you really pooched the wiring

Just wanted to share the outcome of the situation above. Faulty ecu.
But two questions. 1. How do i start the car to get it warm enough to do a rotary compression test with non responding compurter
and 2. If nbrs of this rebuilt are worthy of me getting a computer (used) i know i need the serial nbrs to match to a t. But do i need other things like keys and such.

You will need the same ECU part #... and will have to take it to a dealer or someone that can program it. You will need your "as built" data to program it. Mazda should be able to give you that or they can get it if they do the programming.
You will likely have to reprogram your keys and fobs... but the same ones should work fine.

It is important that whomever does this knows what he is doing. You have to follow the steps to the letter and if something screws up it won't work. Sometimes you have to do it a couple of times before it works. When i did mine it took 3 tries and really no reason for it not working the first two times other than the car pulling our chain
Often the mechanics want to bail out after it doesn't work right away and sell you a new ECU.... It will work if the ECU is good and they keep trying.......so remember that 😀