I have an old Washburn Force 40 that I installed Delano P an J pups in a while ago. The Aguilar I put in I wired as 18 volt. I lost the paperwork. To convert to 9 volt I think I just cut the red wire that goes to the black side of the other battery connector and connect it to the red wire that comes from the main battery connector and runs to the preamp. The main battery connector has the wire going to the instrument cable plug so the one being removed looks like the splice. Does this sound right?