(1) The battery capacity is insufficient. (2) Battery terminals dirty, cable loose (3) Cable connector loose, ground wire corroded (4) Start switch broken (5) Carbon brush poor contact with commutator (6) Starter internal open and short circuit
(1) Battery will charge on demand (2) Clean dirt, fix anchor (3) Fasten connector, remove corrosion (4) Tighten the connector, connect securely. (5) Adjusting the elasticity of the brush spring, cleaning the commutator (6) Overhauling the starting electric motor