Anyone familiar with Fernandes Sustainer?

[axekicker]

Mine stopped working suddenly. It's in a Japanese Fernandes TEJ tele. I replaced the batteries, opened it up, checked all the wires and the battery box and nothing appears loose or undone. I can't figure out what's wrong with it. I have an analogue multimeter,but have no idea how to use it with this device. Any help would be appreciated. Thanks!

[axekicker]

I'm an idiot. Needed to be plugged in to work. I coulda sworn that it worked without a live input, but apparently not.

[sydsbluesky]

I only know that hide used them to kick all kinds of a$$ with his mockingbirds.