1 - This is a community focused on vehicle computers.
2 - This is posted in a forum where people can request input about a proposed vehicle computer setup.
You have exhibited far too much fail in this thread.
The easiest way to wire a headunit into ANY vehicle is to purchase a wiring harness that mates directly to the factory harness and requires no cutting of wires.
So yeah, cutting was bad.
I suggest Googling for information about the wiring of your year/make/model vehicle and using that to help wire up your headunit.