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Q: We have a small black box connected to the negative terminal? on 2000 Ford Escort

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
We replaced the battery and the black box has to be hooked
up or car won't start, Is this just a ground ? And can we just
run the wires from it straight to battery since the box is broke?
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