I got my Big Muff Pi (ca. 1975, v2) down off the shelf after about forty years of neglect and found that the wires connecting the 9V battery harness had detached from wherever they’d been connected. I searched online but couldn’t find any specific instructions relevant to Big Muffs of this vintage. I inferred as best I could and tried soldering the wires back onto where it seemed tney might belong (positive to the center lug of the on-off switch; negative to the input jack), but when I put in a new battery and turned on the unit, I got nothing (except there was an audible click through the amp when I stepped on the switch). I realize my soldered joints are a bit ugly, but I tested them with a meter, and they are actually connected. I’m including a photo of my Big Muff innards in hopes that someone will be able to tell me the right way to wire that battery harness. Thanks in advance for any advice you can offer!