Look at DiMarzio's installation guide for the Ultra Jazz, at http://www.dimarzio.com/sites/defaul.../UltraJazz.pdf
The standard wiring for the Ultra Jazz is to have the coils in series, which (per the installation guide) means the red wire is the "hot" wire, the green wire is the "ground" wire, and the black and white wires get wired together.
That's all the wiring you need to do with the pickups themselves. The wire both pickups to the controls with a switch to put them in series or parallel with each other, look at this diagram for doing that from Best Bass Gear: http://www.bestbassgear.com/wiring-d...ss_bass_sp.pdf
The only difference is, the BBG diagram assumes that the "hot" wire from the pickup is white, but on the Dimarzios it's red, and it assumes that the "ground" wire is black but on the Dimarzios it's green. So, when looking at the BBG diagram, substitute "red" for "white", and "green" for "black" when looking at the wires from the pickups.