Time to get your multimeter out and test the battery.
1. Do it with the ignition off.
2. Do it with the ignition on.
3. Do it with the engine running at idle.
4. Do it with the engine running at a steady state over 4000 revs.
Come and tell us what you have!
Should be about:
1. 12v
2. 11.6v
3. 12v
4. 14.5 tops.
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