Check the Negative (-) terminal clamp is tight
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 retainer
To tighten, a 13mm socket is needed. Not too tight because you may damage the battery casing.
If you have to replace the battery or alternator, click below