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 the terminal, be careful not to short the spanner on the bodywork
Check the battery is generally secure, and if loose, tighten the battery retainer using a 13mm socket.
The battery retainer clamp position. Do not over-tighten as you may damage the battery casing