How do I connect the battery cables correctly on the TB30R?
Always connect the POSITIVE (Red) wire to its terminal first, followed by the NEGATIVE (Black) wire when installing the battery. When removing the battery, disconnect the NEGATIVE (Black) wire first, followed by the POSITIVE (Red) wire. Reversing the connections could change the polarity and result in damage to the engine's alternating system. (Page 14)
From the official Troy Bilt Tb30r manual, page 14
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