How should I connect the battery when installing the Trailblazer 325?
Always stop the engine before connecting or disconnecting battery cables. Observe correct polarity (+ and −), and always disconnect the negative (−) cable first and connect it last to avoid sparks or accidental starting. (Pages 7, 23)
From the official Miller Trailblazer 325 Portable Welder Generator manual, page 23
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