u/CauliflowerExtreme42

I bought a Soarer from a guy who wanted to swap the battery from the front into the trunk. He was mid process when he sold it to me and now I dont know where to begin with the wiring. The things I want to know are how the fusebox is wired to the plus side of the battery, and where the mass cable goes to from the battery. Currently the car has no engine in it so I have all the space to fix electrical wiring. Also dont have electricity going to my interior which causes me to not close my windows. Thanks in advance ! ( English is not my first language )