Bassistrdn

Hello dear friend i will tell my sad story: I recently acquired a Washburn Bantam XB-500 5-string bass with no wires connected to the potentiometers inside the body. The bass' already restored and partially finished. But I can't continue with the remaining part (to connect or rewire the pickups wires and 3-way toggle switch together)... My XB500 model comes with an electronic preamp module with two potentiometers, a lonely potentiometer, a 9-volt battery, a three-way selector switch, and Jazz Bass-style pickups, which means it's an active bass. I need help finding the wiring diagram. I really don't know how to rewire it. Or perhaps could upload some photos showing how it's wired i mean the 3-way toggle switch and pickups wires together. PD: i need to know how to re-connect the 3-way Toggle switch with bridge and neck pickups wires together.. i really dont know how, and i am stuck because of it, sadly my bass has no sound right now. perhaps you gonna say "sorry i dont have the wiring diagram" and i will understand that because it is not easy to get it.. i am simply asking you to take some pictures of the electronics part from the XB500 showing how the 3-way toggle switch and pickups wires are connected together... please bro help me.. cheers John from Guatemala.