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I got this Ibanez TS7 overdrive pedal that only works with an ac adapter, but not with a battery. I opened it up and didn't see any damage or loose cables or anything.

I tried multiple batteries just to make sure it wasn't a dead one. Any ideas about what else I could try checking?

It's gone green and cares too much for the environment to run on batterys.

You could just try wiring on a new battery snap, the old one might have 'snapped' inside.....that's a total guess though, never seen it happen before.