Wiring help please

I am standing in front of my car looking at the lump of wiring that I have cleaned so carefully. I don't have the money for a kit now, as my friend suggested, just run new wires.

I thought perhaps I could place on a large table and cut / re attach wires so there would be a left and right side of the 3 block plug in.

Can anyone give me some tips ?

Thanks
Ian.