As previously mentioned in this topic.
1. Check the battery voltage with the engine running. If it is up at/above 14V then the alternator is charging. The higher the engine revs, the higher the voltage will be. Get someone to rev the engine whilst looking at the voltmeter. If the voltage is around 12-13V, then it is likely that the alternator is not working properly - be that electrical connection or a fault with the alternator itself.
2. If you have access to a decent ammeter (not a cheap one as linked in an earlier post that only measures 250 milliamps - which is 0.25A. More like the 10A plus as mentioned would be better which can be had for about £5.50) then you should measure the current being drawn when everything is off. If this is more than a few tenths of amps, then something maybe drawing off too much current when it shouldn't be. You can start pulling fuses (one at a time) to see which one cuts the current draw down significantlt. This will then seriously reduce the number of possibilities for the faulty component. CD changers in the boot can often be a culprit if you have one?
3. Disconnect the battery and leave overnight after a good run. If the voltage drops below ~12.3V by morning, then the battery is likely duff.
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