How should I connect and disconnect the battery on the Trailblazer 325?
Always disconnect the negative (−) cable first and connect it last. You must stop the engine before disconnecting or connecting battery cables, and always wear a face shield, rubber gloves, and protective clothing when working on the battery. (Page 7)
From the official Miller Trailblazer 325 Portable Welder Generator manual, page 7
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