Break in one of the cables. Found this after installing the cartridge. EDIT: Two of the four wires had no continuity. Apparently they broke during installation, although they didn't look broken. Managed to restore continuity by wiggling and flexing after installation. I'm not sure if impedance is the problem. There is stereo, but it doesn't sound very good. Cheap cartridge with mediocre reviews so not sure if the cartridge and/or this crappy product is to blame. CAUTION: Do not run current through the cartridge. The wires are very thin and will burn if you test them with a multimeter running even a small current through them.
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