Wiring up some OEM functions on a bare bones chassis
 

Hello there - been a long time since I've needed to ask anything but I find myself with an FC in the garage, albeit the only thing FC about it is the exterior. I would like to add some functions, I know there will need to be relays but I'm hoping someone can walk me through it barney style and tell me exactly what relays to buy and how to pin them. I have no factory harnesses on this chassis. Thank you!

Power mirror function, obviously need the switch to adjust them. Between 12v and ground to the switch, what do i need to run to the mirrors themselves?

Power window function; what do i need to run to and from the switches to the window motors?

I need a simple turn signal set up as well, perhaps off a 3 way toggle

First off, I strongly suggest downloading the factory service manual and examining the body electrical and wiring sections. They describe the function and layout of the vehicle's accessories. You can practically build a circuit from scratch with them.

As to adding factory accessories like cruise control and mirrors, you might just be in luck and all you have to do is plug them in. The wiring section shows the location of every plug and switch and the wiring colors.

So, before running any wires, I'd start by checking the wiring harness for any unused plugs and identify them.