New to me Polaroid 250

[campy51]

I picked up a 250 in reasonably good condition but when I was doing the triple a battery mod the black negative wire come off and I don't see where it gets attached. If anyone has one of these and can take a picture of where I should solder it I would appreciate it.

 

[keenmaster486]

If you're lucky, it's a global ground and you can just attach to the frame.