I have looked inside of a Caswell 25 A rectifier; a simple and robust circuit, built like a tank, they're not easy to break.
Since the meters will move you didn't blow the fuse. From what you describe; you may have damaged the ammeter shunt which is difficult at best to do, if we assume your connections are "good".
It's more likely your connections aren't good, or aren't good anymore. How did you hook this up? and with what? You'll need to be pretty specific and detailed, I'm lousy at guessing.
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