Check the Negative (-) terminal clamp is tight
Open the 'Positive' (+) protective cover
Check the Positive (+) terminal clamp is tight. CAUTION If using a spanner to tighten terminal, be careful not to short it on the bodywork
Check battery is generally secure, if loose, tighten the battery retaining clamp
The battery retaining clamp position
To tighten, a 10mm socket is needed. Not too tight because you may damage the battery casing. Tighten both sides equally
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